WO2018214360A1 - 一种用于钙中毒脱硝催化剂的中性络合清洗液及再生方法 - Google Patents

一种用于钙中毒脱硝催化剂的中性络合清洗液及再生方法 Download PDF

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WO2018214360A1
WO2018214360A1 PCT/CN2017/103833 CN2017103833W WO2018214360A1 WO 2018214360 A1 WO2018214360 A1 WO 2018214360A1 CN 2017103833 W CN2017103833 W CN 2017103833W WO 2018214360 A1 WO2018214360 A1 WO 2018214360A1
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catalyst
calcium
dried
denitration catalyst
cleaning liquid
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PCT/CN2017/103833
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French (fr)
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李俊华
李先圣
李想
彭悦
陈建军
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清华大学
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Priority to US16/332,967 priority Critical patent/US11439997B2/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J38/00—Regeneration or reactivation of catalysts, in general
    • B01J38/48—Liquid treating or treating in liquid phase, e.g. dissolved or suspended
    • B01J38/50—Liquid treating or treating in liquid phase, e.g. dissolved or suspended using organic liquids
    • B01J38/52—Liquid treating or treating in liquid phase, e.g. dissolved or suspended using organic liquids oxygen-containing
    • 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
    • B01D53/86—Catalytic processes
    • B01D53/8621—Removing nitrogen compounds
    • B01D53/8625—Nitrogen oxides
    • B01D53/8628—Processes characterised by a specific catalyst
    • 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
    • B01D53/96—Regeneration, reactivation or recycling of reactants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • B01J23/24—Chromium, molybdenum or tungsten
    • B01J23/30—Tungsten
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/90—Regeneration or reactivation
    • B01J23/92—Regeneration or reactivation of catalysts comprising metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/34—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation
    • B01J37/341—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation making use of electric or magnetic fields, wave energy or particle radiation
    • B01J37/343—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation making use of electric or magnetic fields, wave energy or particle radiation of ultrasonic wave energy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J38/00—Regeneration or reactivation of catalysts, in general
    • B01J38/04—Gas or vapour treating; Treating by using liquids vaporisable upon contacting spent catalyst
    • B01J38/12—Treating with free oxygen-containing gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J38/00—Regeneration or reactivation of catalysts, in general
    • B01J38/48—Liquid treating or treating in liquid phase, e.g. dissolved or suspended
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/204—Alkaline earth metals
    • B01D2255/2045—Calcium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/207—Transition metals
    • B01D2255/20707—Titanium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/207—Transition metals
    • B01D2255/20723—Vanadium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/207—Transition metals
    • B01D2255/20776—Tungsten
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/40—Nitrogen compounds
    • B01D2257/404—Nitrogen oxides other than dinitrogen oxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2523/00—Constitutive chemical elements of heterogeneous catalysts

Definitions

  • the invention belongs to the technical field of environmental protection and relates to nitrogen oxide control, in particular to a neutral complex cleaning liquid and a regeneration method for a calcium poisoning denitration catalyst.
  • Nitrogen oxides (NOx) emitted from coal-fired power stations, industrial furnaces, etc. are one of the major pollutants causing environmental degradation in the region, and are also important precursors for acid rain and photochemical smog.
  • Selective catalytic reduction (SCR) is the most efficient technology for fixed source flue gas denitrification and is widely used by coal-fired power plants at home and abroad.
  • SCR Selective catalytic reduction
  • All the thermal power units that have been operated and newly built in China are equipped with denitration devices, mainly using medium and high temperature SCR catalysts, mostly high dust layout processes. This also causes the SCR catalyst to be easily poisoned by the flue gas fly ash while efficiently denitrifying.
  • China's coal contains high levels of calcium, and CaSO 4 produced by the combination of calcium and fly ash in fly ash deposits in the catalyst pores, causing calcium poisoning of the catalyst.
  • CaSO 4 has low solubility and is difficult to remove, the current spent catalyst for calcium poisoning is mainly washed and regenerated with dilute sulfuric acid, but this method will cause a large loss of active components vanadium and tungsten, increase the active material loading process, and emulsifier and dispersant.
  • the use will increase the complexity of the cleaning solution and the cost of use. Therefore, the development of a new and efficient regeneration method for calcium poisoning waste catalysts, the removal of poisonous element calcium, and the reduction of catalyst regeneration liquid formulation to prolong the service life of the catalyst and reduce the regeneration cost. Very necessary.
  • the object of the present invention is to provide a neutral complex cleaning liquid and a regeneration method for a calcium poisoning denitration catalyst, which can be widely applied to denitrification caused by alkaline earth metals such as calcium inactivation.
  • the catalyst removes the poisonous element calcium in a targeted manner and prolongs the service life of the catalyst by simple and efficient regenerant cleaning.
  • a neutral complex cleaning liquid for calcium poisoning denitration catalyst the active ingredient is a polyether surfactant
  • the polyether surfactant is one of JFC-E, NP-10, EL-60, AEO9 or Several mixtures.
  • the concentration of the polyether surfactant is from 0.1 to 1% by weight, and the other component of the cleaning solution is deionized water.
  • the invention is based on the method for regenerating a calcium poisoning denitration catalyst of the neutral complex cleaning liquid, comprising the following steps:
  • Step 1 remove impurities remaining on the surface of the poisoning denitration catalyst and inside the pores, and dry at room temperature for use;
  • Step 2 the dried poisoning denitration catalyst is placed in the neutral complex cleaning solution for ultrasonic cleaning for 30 min - 2 h, and then allowed to stand for 1-24 h;
  • Step 3 The catalyst is taken out after standing, washed, dried, dried, and calcined to obtain a regenerated catalyst.
  • the solid-liquid ratio of the ultrasonic cleaning process is 1:10-1:100, the ultrasonic cleaning time is 0.5-2 h, and the ultrasonic cleaning temperature is 20 °C.
  • the third step it is washed with deionized water, dried to a water content of less than 15-30%, dried at 80-160 ° C for 12-72 h, and then heated to 500-700 ° C at 1-10 ° C / min.
  • the regenerated catalyst was obtained after calcination in an air atmosphere for 4 to 24 hours.
  • the reconstituted liquid of the invention has simple formula and easy operation, and the traditional cleaning liquid formula is simplified, and the cleaning cost is reduced.
  • the calcium removal rate of the invention is high, and is particularly suitable for reuse of the denitration catalyst for high calcium poisoning after regeneration.
  • the formulation of the present invention can retain most of the active components such as vanadium pentoxide, tungsten trioxide and the like while removing a large amount of calcium, and can even omit the late active implantation step of the conventional regeneration technique.
  • the catalyst used in the examples was laboratory prepared in which the mass of V 2 O 5 was 1%, the mass of WO 3 was 9%, the mass of CaO was 4%, and the balance was TiO 2 .
  • Step 1 A deactivated catalyst having a cross section of 150 ⁇ 150 mm, a number of holes of 18 ⁇ 18, and a length of 800 mm was cleaned by compressed air.
  • Step 2 Dissolve 500 g of NP-10 in 100 L of deionized water and configure it into a 0.5% by mass NP-10 solution for use.
  • the dried deactivated catalyst obtained in the first step was placed in the solution for 30 minutes, then allowed to stand for 3 hours, and taken out and drained.
  • Step 3 The catalyst obtained in the second step is taken out, washed 3-4 times with deionized water, and the washed catalyst is dried to a water content of less than 20%, dried at 110 ° C for 12 h, and the dried catalyst is 2 ° C / The temperature was raised to 500 ° C and calcined in an air atmosphere for 4 hours to obtain a regenerated catalyst.
  • Step 1 A deactivated catalyst having a cross section of 150 ⁇ 150 mm, a number of holes of 18 ⁇ 18, and a length of 800 mm was cleaned by compressed air.
  • Step 2 Dissolve 100 g of EL-60 in 100 L of deionized water and configure it to a 0.1% by mass EL-60 solution for use.
  • the dried deactivated catalyst obtained in the first step was placed in the solution for 60 minutes, then allowed to stand for 3 hours, and taken out and drained.
  • Step 3 The catalyst obtained in the second step is taken out, washed 3-4 times with deionized water, and the washed catalyst is dried to a water content of less than 15%, dried at 110 ° C for 12 h, and the dried catalyst is 5 ° C / The temperature was raised to 550 ° C and calcined in an air atmosphere for 4 hours to obtain a regenerated catalyst.
  • Step 1 A deactivated catalyst having a cross section of 150 ⁇ 150 mm, a number of holes of 18 ⁇ 18, and a length of 800 mm was cleaned by compressed air.
  • Step 2 1000 g of AEO9 was dissolved in 100 L of deionized water and placed in a mass fraction of 1% AEO9 solution for use.
  • the dried deactivated catalyst obtained in the first step was placed in the solution for 30 minutes, then allowed to stand for 3 hours, and taken out and drained.
  • Step 3 The catalyst obtained in the second step is taken out, washed 3-4 times with deionized water, and the washed catalyst is dried to a water content of less than 30%, dried at 110 ° C for 12 h, and the dried catalyst is 2 ° C / The temperature was raised to 550 ° C and calcined in an air atmosphere for 6 hours to obtain a regenerated catalyst.
  • the denitration efficiency of the regenerated catalyst of Examples 1-3 and the spent catalyst was compared, and the Ca removal rate, the V 2 O 5 loss rate, and the WO 3 loss rate were measured by ICP-OES.
  • the catalyst denitration rate, Ca removal rate, V 2 O 5 loss rate and WO 3 loss rate were calculated as follows:
  • V 2 O 5 loss rate v ([V 2 O 5 ] poisoned -[V 2 O 5 ] regenerated )/[V 2 O 5 ] poisoned ⁇ 100%
  • WO 3 loss rate w ([WO 3 ] poisoned -[WO 3 ] regenerated )/[WO 3 ] poisoned ⁇ 100%
  • [NO X ] in is the NOx concentration (ppm) at the inlet of the reactor before the reaction
  • [NO X ] out is the concentration (ppm) of NOx in the outlet gas after the reaction.
  • the test conditions are: temperature 350 ° C, atmospheric pressure, reaction space velocity 60000 h -1 , catalyst 0.2 g, flue gas concentration 500 ppm NH 3 , 500 ppm NO, 3% O 2
  • [CaO] poisoned is the poisoning catalyst calcium percentage (calculated as CaO), [CaO] regenerated as the percentage of calcium in the regenerated catalyst (calculated as CaO);
  • [WO 3 ] poisoned is the percentage of tungsten oxide of the poisoning catalyst, [WO 3 ] regenerated as the percentage of tungsten oxide of

Abstract

一种用于钙中毒脱硝催化剂的中性络合清洗液及再生方法，以中性的聚醚类表面活性剂为再生除钙试剂，聚醚类表面活性剂的含量为0.1‑1wt％。再生方法钙去除率高、活性组分流失率低、脱硝活性恢复优异。

Description

一种用于钙中毒脱硝催化剂的中性络合清洗液及再生方法 技术领域
本发明属于环保技术领域，涉及氮氧化物控制，特别涉及一种用于钙中毒脱硝催化剂的中性络合清洗液及再生方法。
背景技术
由燃煤电站、工业窑炉等排放的氮氧化物(NOx)是造成区域环境恶化的主要污染物之一，也是造成酸雨、光化学烟雾的重要前体物。选择性催化还原(SCR)是固定源烟气脱硝的最高效技术，被国内外燃煤电厂广泛采用。“十二五”期间，我国全面开展NOx减排工程，国内己运行和新建的所有火电机组全部配套脱硝装置，主要使用中高温SCR催化剂，大多为高粉尘布置工艺。这也导致SCR催化剂在高效脱硝的同时，容易因为烟气飞灰而造成中毒。一般SCR催化剂设计寿命为3-5年，使用劣质煤会大大降低催化剂使用寿命，我国在2018年后将稳定产生大量的失活催化剂。2014年《关于加强废烟气脱硝催化剂监管工作的通知》(环办函2014[990]号)将钒钛系催化剂列为危险废物，如果将废旧催化剂直接填埋将造成资源浪费与环境污染。催化剂再生可以恢复催化剂活性实现资源的循环利用，已经成为最佳的废催化剂处理方式。
我国的煤中钙元素含量高，飞灰中的钙元素与硫酸根结合产生的CaSO4沉积在催化剂孔道内造成催化剂钙中毒。因为CaSO4溶解性低难以去除，目前针对钙中毒废旧催化剂主要使用稀硫酸清洗再生，但该方法会造成大量的活性成分钒、钨的流失，增加了活性物质负载工艺，并且乳化剂、分散剂的使用会增加清洗液的复杂程度和使用成本，因此开发针对钙中毒废旧催化剂的新型高效的再生方法，定向去除中毒元素钙，精简催化剂再生液配方，以延长催化剂使用寿命，降低再生成本，是十分必要的。
发明内容
为了克服上述现有技术的缺点，本发明的目的在于提供一种用于钙中毒脱硝催化剂的中性络合清洗液及再生方法，可以广泛应用于钙致失活等碱土金属致失活的脱硝催化剂，定向去除中毒元素钙，并通过简单、高效再生液清洗延长催化剂使用寿命。
为了实现上述目的，本发明采用的技术方案是：
一种用于钙中毒脱硝催化剂的中性络合清洗液，有效成分为聚醚类表面活性剂，聚醚类表面活性剂为JFC-E、NP-10、EL-60、AEO9的一种或几种的混合物。
所述聚醚类表面活性剂的浓度为0.1-1wt％，清洗液的其它成分为去离子水。
本发明基于所述中性络合清洗液的钙中毒脱硝催化剂再生方法，包括如下步骤：
步骤一：清除中毒脱硝催化剂表面和孔道内部残留的杂质，常温干燥后待用；
步骤二：将干燥后的中毒脱硝催化剂，置于所述中性络合清洗液中超声清洗30min-2h，随后静置1-24h；
步骤三：将静置后催化剂取出，清洗、晾干、干燥、煅烧，得到再生催化剂。
所述步骤二中，超声清洗过程固液比为1:10-1:100，超声清洗时间为0.5-2h，超声清洗温度为20℃。
所述步骤三中，以去离子水清洗，晾干至水含量低于15-30％后，于80-160℃干燥12-72h，再以1-10℃/min升温至500-700℃，在空气气氛下煅烧4-24h后得到再生催化剂。
与现有技术相比，本发明的有益效果是：
1.本发明的再生液配方简单，操作易行，精简了传统清洗液配方，降低了清洗成本。
2.本发明钙去除率高，特别适合于高钙中毒的脱硝催化剂再生后重新利用。
3.本发明的配方可以在大量的钙去除的同时，保留大部分的五氧化二钒、三氧化钨等活性组分，甚至可以省略常规再生技术的后期的活性植入步骤。
具体实施方式
下面结合实施例详细说明本发明的实施方式。
实施例中使用的催化剂为实验室制备，其中V2O5质量为1％，WO3质量为9％，CaO质量为4％，其余为TiO2。
实施例一
一种用于钙中毒脱硝催化剂的高效络合再生方法
步骤一：将截面为150×150mm，孔数为18×18，长度800mm的失活催化剂，利用压缩空气清灰。
步骤二：将500g的NP-10溶于100L去离子水中，配置成质量分数0.5％的NP-10溶液待用。将步骤一所得到的干燥失活催化剂，置于该溶液中超声30min，随后静置3h，取出沥干。
步骤三：将步骤二得到的催化剂取出，利用去离子水清洗3-4次，洗净的催化剂晾干至水含量低于20％后于110℃干燥12h，烘干后的催化剂以2℃/min升温至500℃在空气气氛下煅烧4小时后得到再生催化剂。
实施例二
一种用于钙中毒脱硝催化剂的高效络合再生方法
步骤一：将截面为150×150mm，孔数为18×18，长度800mm的失活催化剂，利用压缩空气清灰。
步骤二：将100g的EL-60溶于100L去离子水中，配置成质量分数0.1％的EL-60溶液待用。将步骤一所得到的干燥失活催化剂，置于该溶液中超声60min，随后静置3h，取出沥干。
步骤三：将步骤二得到的催化剂取出，利用去离子水清洗3-4次，洗净的催化剂晾干至水含量低于15％后于110℃干燥12h，烘干后的催化剂以5℃/min升温至550℃在空气气氛下煅烧4小时后得到再生催化剂。
实施例三
一种用于钙中毒脱硝催化剂的高效络合再生方法
步骤一：将截面为150×150mm，孔数为18×18，长度800mm的失活催化剂，利用压缩空气清灰。
步骤二：将1000g的AEO9溶于100L去离子水中，配置成质量分数1％的AEO9溶液待用。将步骤一所得到的干燥失活催化剂，置于该溶液中超声30min，随后静置3h，取出沥干。
步骤三：将步骤二得到的催化剂取出，利用去离子水清洗3-4次，洗净的催化剂晾干至水含量低于30％后于110℃干燥12h，烘干后的催化剂以2℃/min升温至550℃在空气气氛下煅烧6小时后得到再生催化剂。
使用实施例1-3的再生催化剂和失效催化剂脱硝效率进行对比，并利用ICP-OES测试Ca去除率、V2O5流失率和WO3流失率。
催化剂脱硝率、Ca去除率、V2O5流失率和WO3流失率按如下公式计算：
脱硝效率η＝([NOX]in-[NOX]out)/[NOX]in×100％
Ca去除率c＝([CaO]poisoned-[CaO]regenerated)/[CaO]poisoned×100％
V2O5流失率v＝([V2O5]poisoned-[V2O5]regenerated)/[V2O5]poisoned×100％
WO3流失率w＝([WO3]poisoned-[WO3]regenerated)/[WO3]poisoned×100％
其中：[NOX]in为反应前反应器进口的NOx浓度(ppm)，[NOX]out为反应后出口气体中NOx的浓度(ppm)。测试条件为：温度350℃、常压、反应空速60000h-1，催化剂取0.2g，烟气浓度为500ppm NH3，500ppm NO，3％O2；[CaO]poisoned为中毒催化剂钙百分含量(以CaO计)，[CaO]regenerated为再生催化剂钙百分含量(以CaO计)；[V2O5]poisoned为中毒催化剂氧化钒百分含量，[V2O5]regenerated为再生催化剂的氧化钒百分含量；[WO3]poisoned为中毒催化剂氧化钨百分含量，[WO3]regenerated为再生催化剂的氧化钨百分含量。
下表总结了上述实施例的实验结果。
实施例 脱硝效率(％) Ca去除率(％) V2O5流失率(％) WO3流失率(％)
1 90.1 88.1 11.8 1.1
2 75.0 76.5 2.1 2.8
3 69.6 87.2 1.6 0.5

Claims (5)

  1. 一种用于钙中毒脱硝催化剂的中性络合清洗液，其特征在于，有效成分为聚醚类表面活性剂，聚醚类表面活性剂为JFC-E、NP-10、EL-60、AEO9的一种或几种的混合物。
  2. 根据权利要求1所述用于钙中毒脱硝催化剂的中性络合清洗液，其特征在于，所述聚醚类表面活性剂的浓度为0.1-1wt％，清洗液的其它成分为去离子水。
  3. 基于权利要求1所述中性络合清洗液的钙中毒脱硝催化剂再生方法，其特征在于，包括如下步骤：
    步骤一：清除中毒脱硝催化剂表面和孔道内部残留的杂质，常温干燥后待用；
    步骤二：将干燥后的中毒脱硝催化剂，置于所述中性络合清洗液中超声清洗30min-2h，随后静置1-24h；
    步骤三：将静置后催化剂取出，清洗、晾干、干燥、煅烧，得到再生催化剂。
  4. 根据权利要求3所述再生方法，其特征在于，所述步骤二中，超声清洗过程固液比为1∶10-1∶100，超声清洗时间为0.5-2h，超声清洗温度为20℃。
  5. 根据权利要求3所述再生方法，其特征在于，所述步骤三中，以去离子水清洗，晾干至水含量低于15-30％后，于80-160℃干燥12-72h，再以1-10℃/min升温至500-700℃，在空气气氛下煅烧4-24h后得到再生催化剂。
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