阅读说明：本技术 一种催化剂清洗剂及清洗方法 (Catalyst cleaning agent and cleaning method ) 是由 卞子君 孔凡海 何川 雷嗣远 王丽朋 于 2020-12-29 设计创作，主要内容包括：本发明涉及一种催化剂清洗剂,浸泡液包括以下重量百分比的组分：碱金属氢氧化物0.1-3%,碱金属磷酸盐0.1-2%,其余为水；清洗液：包括以下重量百分比的组分：硫酸1-5%,三乙醇胺0.2-1%,十二烷基硫酸钠0.2-5%,丁醇0-1%,其余为水。其清洗方法包括：制备浸泡液、清洗液,将催化剂置于所述的浸泡液内浸泡1-3小时后取出干燥,将浸泡后的催化剂置于所述的清洗液内搅拌1-3小时,再震荡0.2-0.7小时后取出,使用清水冲洗0.2-0.7小时候取出干燥。本发明通过两步法实现对催化剂的再生清洗,实现灰垢的软化,且保留催化剂外表面的完整,同时不会造成碱金属污染,能够同步实现低泡性能以及较好的清洗效果。(The invention relates to a catalyst cleaning agent, wherein a soaking solution comprises the following components in percentage by weight: 0.1-3% of alkali metal hydroxide, 0.1-2% of alkali metal phosphate and the balance of water; cleaning solution: comprises the following components in percentage by weight: 1-5% of sulfuric acid, 0.2-1% of triethanolamine, 0.2-5% of sodium dodecyl sulfate, 0-1% of butanol and the balance of water. The cleaning method comprises the following steps: preparing a soaking solution and a cleaning solution, placing the catalyst in the soaking solution, soaking for 1-3 hours, taking out and drying, placing the soaked catalyst in the cleaning solution, stirring for 1-3 hours, shaking for 0.2-0.7 hour, taking out, washing with clean water for 0.2-0.7 hour, and taking out and drying. The method realizes regeneration cleaning of the catalyst through a two-step method, realizes softening of ash scale, keeps the integrity of the outer surface of the catalyst, does not cause alkali metal pollution, and can synchronously realize low-foam performance and better cleaning effect.)

1. A catalyst cleaning agent is characterized in that: the method comprises the following steps:

soaking liquid: comprises the following components in percentage by weight: 0.1-3% of alkali metal hydroxide, 0.1-2% of alkali metal phosphate and the balance of water;

cleaning solution: comprises the following components in percentage by weight: 1-5% of sulfuric acid, 0.2-1% of triethanolamine, 0.2-5% of sodium dodecyl sulfate, 0-1% of butanol and the balance of water.

2. The catalyst cleaning agent according to claim 1, wherein: the soaking solution and the cleaning solution also comprise 0-10 wt% of an auxiliary agent, and the auxiliary agent is chloride.

3. The catalyst cleaning agent according to claim 1, wherein: the pH value of the soaking solution is 7-9.

4. The catalyst cleaning agent according to claim 1, wherein: the pH value of the cleaning solution is 4-6.5.

5. The catalyst cleaning agent according to claim 1, wherein: the alkali metal hydroxide is selected from one or more of sodium hydroxide and potassium hydroxide.

6. The catalyst cleaning agent according to claim 1, wherein: the alkali metal phosphate is selected from one or more of sodium phosphate and potassium phosphate.

7. The catalyst cleaning agent according to claim 1, wherein: in the soaking solution, the alkali metal hydroxide is 0.3-0.9%; 0.1-0.6% of alkali metal phosphate.

8. A method for cleaning a catalyst using the cleaning agent according to any one of the preceding claims, which comprises: the method sequentially comprises the following steps:

(1) preparing a soaking solution and a cleaning solution,

(2) soaking the catalyst in soaking liquid, taking out and drying,

(3) and placing the soaked catalyst in a cleaning solution, stirring, vibrating, taking out, washing with clean water, and taking out and drying.

9. Use according to claim 8, characterized in that: the catalyst is placed in the soak solution for soaking for 1 to 3 hours.

10. Use according to claim 8, characterized in that: the catalyst is placed in a cleaning solution to be stirred for 1 to 3 hours, vibrated for 0.2 to 0.7 hour and washed for 0.2 to 0.7 hour.

Technical Field

The invention belongs to the field of catalyst regeneration in the power industry, and particularly relates to a catalyst cleaning agent and a cleaning method.

Background

The regeneration of the catalyst mainly carries out the channel dredging by various physical and chemical means, removes harmful substances on the surface and increases active sites, and the key technology lies in the research and development of the formula of the efficient cleaning agent and the cleaning process. The regeneration technology of the SCR catalyst at present mainly comprises water washing regeneration, thermal reduction regeneration, acid liquor regeneration and SO₂And (4) acidifying and regenerating. According to different coal quality conditions of power plants, different catalysts can be used, and according to different inactivation reasons and degrees of the catalysts, different cleaning processes can be used. In the chemical cleaning of the catalyst, a chemical reagent with a dissolving effect or a replacing effect on the ash dirt impurities is selected, and a proper cleaning method is selected according to different pollutants.

The common cleaning agent carries out part of ash and dirt from the surface of the catalyst by depending on foam components in the cleaning agent, and in actual production, more foams exist, and the pressure on subsequent cleaning and water treatment is higher, so that the development of the cleaning agent with relatively less foams and still superior cleaning performance is needed.

Disclosure of Invention

The invention aims to provide a catalyst cleaning agent which is suitable for regeneration cleaning of an SCR catalyst.

In order to achieve the purpose, the invention adopts the technical scheme that:

a catalyst cleaner comprising:

soaking liquid: comprises the following components in percentage by weight: 0.1-3% of alkali metal hydroxide, 0.1-2% of alkali metal phosphate and the balance of water;

cleaning solution: comprises the following components in percentage by weight: 1-5% of sulfuric acid, 0.2-1% of triethanolamine, 0.2-5% of sodium dodecyl sulfate, 0-1% of butanol and the balance of water.

The soaking solution adopts alkali metal hydroxide and alkali metal phosphate, the alkali metal hydroxide can be added to create an alkali washing environment, and the softening effect of dirt in the catalyst can be realized through soaking; the alkali metal phosphate is used for stabilizing the pH value of the soaking solution and adjusting the pH value.

In the cleaning solution: sulfuric acid ensures that the cleaning solution is in a weak acidic large environment, and triethanolamine and sodium dodecyl sulfate can adjust the pH value on one hand and realize foaming and cleaning on the other hand; butanol can reduce the surface tension of the catalyst, and the cleaning solution is a stable concentrated system and reaches the standard in detergency after dilution.

Preferably, the soaking solution and the cleaning solution further comprise 0-10 wt% of an auxiliary agent, and the auxiliary agent is chloride. Such as sodium chloride, potassium chloride, etc., can achieve the thickening effect of the cleaning agent.

Preferably, the pH of the soaking solution is 7-9, so that the soaking solution is weakly alkaline. Preferably, the pH value of the cleaning solution is 4-6.5, so that the cleaning solution is weakly acidic.

Preferably, the alkali metal hydroxide is selected from one or more of sodium hydroxide and potassium hydroxide.

Preferably, the alkali metal phosphate is selected from one or more of sodium phosphate and potassium phosphate.

Preferably, in the soaking solution, the alkali metal hydroxide is 0.3-0.9%; 0.1-0.6% of alkali metal phosphate.

The invention also aims to provide a method for cleaning the catalyst, which realizes the cleaning of the catalyst through the soaking solution and the cleaning solution.

In order to achieve the purpose, the invention adopts the technical scheme that:

a cleaning method of a catalyst comprises the following steps: the method comprises the following steps:

(1) preparing a soaking solution and a cleaning solution, wherein the soaking solution is prepared from the following components in percentage by weight: 0.1-3% of alkali metal hydroxide, 0.1-2% of alkali metal phosphate and the balance of water; the cleaning solution is prepared from the following components in percentage by weight: 1 to 5 percent of sulfuric acid, 0.2 to 1 percent of triethanolamine, 0.2 to 5 percent of sodium dodecyl sulfate, 0 to 1 percent of butanol and the balance of water,

(2) soaking the catalyst in the soaking solution for 1-3 hr, drying,

(3) and placing the soaked catalyst in the cleaning solution, stirring for 1-3 hours, shaking for 0.2-0.7 hour, taking out, washing with clean water for 0.2-0.7 hour, and taking out and drying.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:

the method realizes regeneration cleaning of the catalyst through a two-step method, realizes softening of ash scale, keeps the integrity of the outer surface of the catalyst, does not cause alkali metal pollution, and can synchronously realize low-foam performance and better cleaning effect.

Detailed Description

The technical solutions of the present invention are described clearly and completely below, and it is obvious that the described embodiments are some, not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

A catalyst cleaner comprising:

soaking liquid: comprises the following components in percentage by weight: 0.1-3% of alkali metal hydroxide, 0.1-2% of alkali metal phosphate, 0-10% of assistant and the balance of water; the alkali metal hydroxide can be selected from one or more of sodium hydroxide and potassium hydroxide; the alkali metal phosphate can be one or more selected from sodium phosphate and potassium phosphate; the auxiliary agent can be selected from sodium chloride, potassium chloride and the like.

Cleaning solution: comprises the following components in percentage by weight: 1-5% of sulfuric acid, 0.2-1% of triethanolamine, 0.2-5% of sodium dodecyl sulfate, 0-1% of butanol, 0-10% of an auxiliary agent and the balance of water.

The method for cleaning the catalyst by using the cleaning agent of the embodiment is specifically described as follows:

preparing a soak solution:

10g of NaOH is prepared and dissolved into 100ml of aqueous solution, named solution A,

10g of Na is prepared₃PO₄Dissolved as 100ml of aqueous solution, named solution B,

AB1, weighing 3ml A +1mlB, and diluting to 100ml solution, i.e. 0.3% NaOH + 0.1% Na₃PO₄；

AB2, weighing 5ml A +2mlB, and diluting to 100ml solution, i.e. 0.5% NaOH + 0.2% Na₃PO₄；

AB3, weighing 9ml A +6mlB, and diluting to 100ml solution, namely 0.9% NaOH + 0.6% Na₃PO₄；

AB4, measuring 1ml A +0.4mlB, and diluting to 100ml solution, namely 0.1% NaOH + 0.4% Na₃PO₄；

AB 1-4: the auxiliary agent is prepared by 0.1 percent,

and (3) carrying out pre-soaking treatment on the catalyst by using the 4 types of weak alkaline aqueous solutions with different concentrations for 2h, and carrying out XRF characterization after drying.

Table 1: the soaking effect of the weakly alkaline soaking solution is as follows:

from the weak alkaline soak soaking effect of table 1: the surface structure of the catalyst has no obvious change, the ash scale is not obviously peeled off in the soaking process in the step but is softened to a certain degree, Na element can not be detected in the catalyst treated by the alkaline soaking solution, alkali metal pollution is not caused, and the catalyst is beneficial to next step of cleaning. From the results of the elemental analysis, it can be seen that the formulation AB2, i.e., 0.5% NaOH + 0.2% Na₃PO₄The alkaline soaking pretreatment effect is good, and under the condition of less component consumption, the reduction of partial components such as silicon, aluminum, sulfur and calcium and the like can be realized, the softening of ash scale is realized, and the integrity of the outer surface of the catalyst is kept.

Preparing a cleaning solution:

triethanolamine designation C, sodium dodecyl sulfate designation D, sulfuric acid designation E, respectively:

the CDE1 cleaning agent has a formula of 1% of C, 2% of D and 3% of E;

the CDE2 cleaning agent has a formula of 0.7% of C, 1.5% of D and 3% of E;

the CDE3 cleaning agent has a formula of 0.4% of C, 0.8% of D and 3% of E;

the CDE4 cleaning agent has a formula of 0.2% of C, 0.4% of D and 0.8% of E;

in CDE 1-4: all the auxiliary agents are prepared in 0.1 percent,

AB2 (0.5% NaOH + 0.2% Na) after the previous step of weakly alkaline soaking₃PO₄) And (3) carrying out weak acid cleaning on the catalyst, carrying out bubbling stirring for 2h, carrying out ultrasonic oscillation for 0.5h, washing with clear water for 0.5h, and drying to obtain a sample for XRF characterization.

Table 2: the washing effect of the weak-acid cleaning solution is compared with that of a commercial cleaning agent:

from the washing effect of the weakly acidic cleaning solution of table 2: to reduce the generation of foam, the amount of surfactant needs to be reduced and it is ensured that the cleaning performance is not reduced. Both the CDE2 and the CDE3 cleaning liquid can realize better cleaning of the catalyst on the premise of reducing foams. The CDE2 scheme is slightly conservative, so that 20-30% of foam can be reduced, and effective cleaning is realized; CDE3, can reduce 30-40% of foam, and the cleaning effect can also keep a higher level.

To achieve low-foaming cleaning, a method of reducing the content of the surfactant is possible, but at the same time, partial cleaning performance is also reduced, and the cleaning effect needs to be ensured by the increase of the acidic substance. The simultaneous reduction of surfactant and acidic species can affect cleaning performance. Experiments prove that the CD component in the formula is reduced, the E is properly improved, and the cleaning performance under low foam can be better realized, and the CDE3 is the optimal scheme of the current cleaning agent and can synchronously realize the low foam performance and the better cleaning effect.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.