A synergistic ash cleaning and decoking dust suppressant and method of making same

Abstract

The application relates to the field of energy saving and environmental protection, and provides a synergistic ash cleaning, coking removing and dust suppressing agent and a preparation method thereof, wherein the synergistic ash cleaning, coking removing and dust suppressing agent comprises the following raw materials in proportion by weight: 10-15 parts of cerium oxide, 3-7 parts of silicon carbide, 5-10 parts of borax, 3-7 parts of urea, 6-12 parts of carboxylic acid, 10-20 parts of a combustion improver, 25-35 parts of modified activated clay, 10-20 parts of modified xanthan gum, 10-20 parts of carboxymethyl cellulose, 1-3 parts of a preservative and 0.5-2 parts of sodium dodecyl benzene sulfonate. The synergistic ash cleaning, coking removing and dust suppressing agent has the functions of efficient ash cleaning, coking removal and dust suppression, and has good commercial application value.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of energy saving and environmental protection, and particularly relates to a synergistic ash removal and decoking dust suppressant and a preparation method thereof. BACKGROUND

[0002] During the coal combustion process of a coal-fired boiler, the heated surface of the water-cooled wall pipeline is prone to coking, and the superheater and reheater pipelines are prone to ash accumulation, which will cause the heat exchange efficiency of the boiler to decrease, the exhaust gas temperature to increase, and the energy consumption to increase, and the heated surface of the pipeline is prone to sulfate corrosion due to severe coking, which shortens the service life of the boiler, etc. These problems will seriously affect the safe and economic operation of the boiler, and the total coal always contains carbon, sulfur, water, and other mineral impurities, and the flue gas produced during combustion contains sulfur dioxide and nitrogen oxides, which will also pollute the air. And during the transportation of coal, the mine dust contains various heavy metals, and the flying dust can adsorb various toxic substances, and the flying dust adsorbed with toxic substances drifts everywhere, seriously polluting the environment we live in.

[0003] Currently, for the ash removal and coking problems of industrial boilers and large station boilers, two methods are usually used, namely, stopping the boiler for manual ash removal and decoking, or adding specific chemical agents, namely chemical ash removal and decoking agents, to the boiler. Compared with manual ash removal and decoking, the chemical ash removal and decoking agents can react with the substances in the ash to remove the coking of the heated surface and have a double effect of removal and prevention, which can ensure the safe and economic operation of the boiler. However, there are not many decoking and ash removal agents on the market that have dust suppression performance, and if some substances with dust suppression performance, such as xanthan gum, are simply added, they may have the disadvantage of poor heat resistance. In addition, some substances with adsorption function in the decoking and ash removal agent, such as activated carbon and activated clay, also have the limitation of limited adsorption capacity.

[0004] Patent CN 111349421B discloses an environmentally friendly dust suppressant and a preparation method thereof. The raw materials of the environmentally friendly dust suppressant prepared by the application include modified starch, carboxymethyl cellulose, xanthan gum, guar gum, potassium sulfate, sodium sulfate, magnesium sulfate, hydroxypropyl methyl cellulose, and a surfactant, which can bond and consolidate the dust on the surface of bare soil and effectively suppress the dust phenomenon on the surface of bare soil. However, the xanthan gum used in the application has the hidden danger of insufficient heat resistance and cannot be used for a long time in some extreme environments such as high temperature.

[0005] Therefore, there is an urgent need for a synergistic ash removal and decoking dust suppressant on the market that has efficient ash removal and decoking and dust suppression functions. SUMMARY

[0006] In view of the problems in the prior art, the present application synthesizes a synergistic ash removal and decoking dust suppressant by taking cerium oxide, modified activated clay, and modified xanthan gum as main components, which has efficient ash removal and decoking and dust suppression functions.

[0007] To achieve the above object, the technical scheme adopted by the present application is as follows:

[0008] The synergistic ash cleaning and decoking dust suppressant comprises, by weight fraction, 10-15 parts of cerium oxide, 3-7 parts of silicon carbide, 5-10 parts of borax, 3-7 parts of urea, 6-12 parts of carboxylic acid, 10-20 parts of combustion improver, 25-35 parts of modified activated clay, 10-20 parts of modified xanthan gum, 10-20 parts of carboxymethyl cellulose, 1-3 parts of preservative, and 0.5-2 parts of sodium dodecyl benzene sulfonate.

[0009] The preservative is benzisothiazolinone.

[0010] In some embodiments of the present application, the carboxylic acid is any one of citric acid, tartaric acid, oxalic acid and acetic acid.

[0011] In some embodiments of the present application, the combustion improver is a mixture of barium nitrate and potassium permanganate.

[0012] Preferably, the mass ratio of barium nitrate to potassium permanganate is (2-3):1.

[0013] More preferably, the mass ratio of barium nitrate to potassium permanganate is 2.5:1.

[0014] In some embodiments of the present application, the preparation method of the modified activated clay comprises the following steps:

[0015] (1) mixing diethylenetriamine propyl trimethoxysilane and toluene, stirring, transferring to a reaction container, adding activated clay, heating to 75-85℃, stirring, cooling to room temperature, centrifuging, washing, drying, and cooling to room temperature to obtain the product for standby use;

[0016] (2) mixing chitosan and isopropyl alcohol, stirring, adding sodium hydroxide aqueous solution, stirring, adding chloroacetic acid, heating to 55-65℃, stirring, cooling to room temperature, washing, standing, removing the upper solution, adding anhydrous ethanol, suction filtering, washing, and drying to obtain carboxymethyl chitosan for standby use;

[0017] (3) taking the carboxymethyl chitosan of step (2), adding acetic acid aqueous solution, stirring, adding the product of step (1), heating to 55-65℃, stirring, suction filtering, and drying to obtain the modified activated clay.

[0018] In step (2), the mass ratio of chitosan to chloroacetic acid is 1:(2.5-3.5).

[0019] In some embodiments of the present application, in step (1), the mass ratio of activated clay and diethylenetriamine propyl trimethoxysilane is 1:(0.2-0.4).

[0020] Preferably, in step (1), the mass ratio of activated clay and diethylenetriamine propyl trimethoxysilane is 1:0.33.

[0021] In some embodiments of the present application, in step (3), the mass ratio of product and carboxymethyl chitosan is 1:(0.05-0.2).

[0022] Preferably, in step (3), the mass ratio of product and carboxymethyl chitosan is 1:0.1.

[0023] Activated clay can be used as an adsorbent for dust removal and decoking due to its microporous structure and large specific surface area, and can also be used as a carrier for cerium, a component that catalyzes dust removal and decoking, thereby promoting dust removal and decoking. However, the adsorption capacity of activated clay is limited, resulting in less than ideal adsorption effect and limited dust removal and decoking performance.

[0024] The applicant first organically modified activated clay with diethylenetriamine propyl trimethoxysilane, which entered the interlayer of activated clay and achieved the peeling of the structure of activated clay to obtain a product, thereby increasing the specific surface area and looseness of activated clay and improving the adsorption of activated clay, and further improving the dust removal and decoking effect of activated clay. Further, the applicant prepared carboxymethyl chitosan by modifying chitosan with chloroacetic acid, and compounded carboxymethyl chitosan with the product, which embedded the carboxymethyl chitosan into the lamellar structure of the product, thereby improving the structural stability of the modified activated clay, solving the problem of easy collapse of the lamellar structure of activated clay and the resulting decline in adsorption performance, and further improving the dust removal and decoking effect of the modified activated clay.

[0025] In some embodiments of the present application, the preparation method of the modified xanthan gum comprises the following steps:

[0026] 1) Add 2-octyl-2,3-dihydrothiopheno[3,4-B][1,4]dioxin to a hyaluronic acid aqueous solution, stir, pass inert gas, and dropwise add ammonium persulfate aqueous solution, stir for 11-13 h, wash, centrifuge, take the precipitate, wash, and dry to obtain nanoparticles for standby;

[0027] 2) Add xanthan gum to deionized water, stir, add the nanoparticles of step 1), stir, add gluconolactone, stir, and stand at -25 to -15℃ for 8-10 h, and freeze-dry to obtain the modified xanthan gum.

[0028] In some embodiments of the present application, in the step 1), the mass ratio of 2-octyl-2,3-dihydrothieno[3,4-B][1,4]dioxin and hyaluronic acid in the aqueous solution of hyaluronic acid is 1:(2.5-3).

[0029] Preferably, in the step 1), the mass ratio of 2-octyl-2,3-dihydrothieno[3,4-B][1,4]dioxin and hyaluronic acid in the aqueous solution of hyaluronic acid is 1:2.95.

[0030] In some embodiments of the present application, in the step 2), the mass ratio of xanthan gum and nanoparticles is 1:(0.1-0.3).

[0031] Preferably, in the step 2), the mass ratio of xanthan gum and nanoparticles is 1:0.2.

[0032] Currently, there are few de-foaming and ash-removing agents on the market with dust suppression performance. Xanthan gum, as a microbial extracellular polysaccharide, can improve the overall viscosity of the de-foaming and ash-removing agent and improve the adhesion of the de-foaming and ash-removing agent on the surface of the object, thereby playing a dust suppression effect. However, as a natural macromolecular substance, xanthan gum still has certain limitations in heat resistance.

[0033] The applicant selects 2-octyl-2,3-dihydrothieno[3,4-B][1,4]dioxin as the raw material, obtains nanoparticles by doping with hyaluronic acid, and then introduces the nanoparticles into the xanthan gum matrix to prepare modified xanthan gum. On the one hand, 2-octyl-2,3-dihydrothieno[3,4-B][1,4]dioxin introduces long alkyl chains and thienyl ring structures into the structure of the modified xanthan gum, effectively improving the stability and thermal stability of the modified xanthan gum. On the other hand, the nanoparticles synthesized by doping 2-octyl-2,3-dihydrothieno[3,4-B][1,4]dioxin with hyaluronic acid introduce crosslinking sites into the xanthan gum, forming a stable network structure inside the modified xanthan gum, further improving the thermal stability of the modified xanthan gum.

[0034] The present application also provides a preparation method of the synergistic ash-removing and de-foaming dust suppression agent.

[0035] The cerium oxide, silicon carbide, borax, urea, carboxylic acid, combustion improver, modified activated clay, modified xanthan gum, carboxymethyl cellulose, preservative and sodium dodecyl benzene sulfonate are mixed, stirred, dried, crushed and sieved to obtain the synergistic ash-removing and de-foaming dust suppression agent.

[0036] Compared with the prior art, the present application has the following beneficial effects:

[0037] (1) The application synthesizes a synergistic ash cleaning and coking removing and dust suppressing agent by taking cerium oxide, modified activated clay and modified xanthan gum as main components, and through the synergistic effect between the components, the synergistic ash cleaning and coking removing and dust suppressing agent has the functions of high-efficiency ash cleaning and coking removal and dust suppression.

[0038] (2) The application first modifies the activated clay by diethylenetriamine propyl trimethoxysilane, and then synthesizes the modified activated clay by introducing carboxymethyl chitosan, so as to improve the adsorption and structural stability of the activated clay, and further improve the ash cleaning and coking removal effect of the activated clay.

[0039] (3) The application selects 2-octyl-2,3-dihydrothiophene[3,4-B][1,4]dioxin as a raw material, obtains nanoparticles by doping hyaluronic acid, and then introduces the nanoparticles into a xanthan gum matrix to prepare the modified xanthan gum, so as to effectively improve the thermal stability of the xanthan gum.

[0040] (4) The synergistic ash cleaning and coking removing and dust suppressing agent prepared by the application has the functions of high-efficiency ash cleaning and coking removal and dust suppression, and can be widely applied to the fields of boiler ash cleaning and coking removal, construction site dust suppression and railway and mine dust suppression, and has good commercial application value. DETAILED DESCRIPTION

[0041] The application will be described below in combination with specific embodiments. It should be noted that the following examples are only used to illustrate the application, and are not used to limit the application. Other combinations and various modifications within the concept of the application can be made without departing from the main idea or scope of the application.

[0042] In the following examples and comparative examples, the compounds monomers and related reagents used except the modified activated clay and the modified xanthan gum can be purchased from the market, wherein the activated clay is purchased from Tianjin Yandong Haotian Mining Products Co., Ltd.; the chitosan is purchased from Shaanxi Ran'guang Biological Technology Co., Ltd.; and the carboxymethyl cellulose is purchased from Jinan Mingjiang Chemical Co., Ltd.

[0043] Preparation Example 1

[0044] The synthesis method of the modified activated clay A includes the following steps:

[0045] (1) 1g of diethylenetriamine propyl trimethoxysilane and 20ml of toluene are mixed, stirred for 15min, then transferred to a polytetrafluoroethylene reaction container, 3g of activated clay is added, heated to 80℃, stirred for 4h, cooled to room temperature, centrifuged, washed with acetone for 3 times, dried at 100℃ for 12h, and cooled to room temperature to obtain the product for standby use;

[0046] (2) 1 g of chitosan was mixed with 30 ml of isopropyl alcohol, stirred for 1 h, 10 ml of 35 wt% aqueous sodium hydroxide solution was added, stirred for 2 h, 3 g of chloroacetic acid was added, heated to 60°C, stirred for 4 h, cooled to room temperature, washed with deionized water until pH = 7, stood for 8 h, removed the upper solution, added 40 ml of anhydrous ethanol, suction filtered, washed with deionized water for 3 times, dried at 60°C for 24 h to obtain carboxymethyl chitosan for standby;

[0047] (3) 0.5 g of carboxymethyl chitosan of step (2) was taken, 1 wt% acetic acid aqueous solution was added to adjust pH = 5, stirred for 1 h, 5 g of the product of step (1) was added, heated to 60°C, stirred for 6 h, suction filtered, dried at 60°C for 24 h to obtain modified activated white clay A.

[0048] Preparation Example 2

[0049] Modified activated white clay B, the specific implementation method is the same as modified activated white clay A, the difference is that in step (1), the mass of diethylenetriamine propyl trimethoxysilane is replaced by 0.4 g.

[0050] Preparation Example 3

[0051] Modified activated white clay C, the specific implementation method is the same as modified activated white clay A, the difference is that in step (3), the mass of carboxymethyl chitosan is replaced by 0.15 g.

[0052] Preparation Example 4

[0053] The synthesis method of modified xanthan gum A includes the following steps:

[0054] 1) 12.7 g of 2-octyl-2,3-dihydrothieno[3,4-B][1,4]dioxine was added to 300 ml of 0.125 g / ml hyaluronic acid aqueous solution, stirred for 30 min, nitrogen was introduced for 30 min, 20 ml of 0.015 mol / L ammonium persulfate aqueous solution was added dropwise, stirred for 12 h, washed with 100 ml of acetone, centrifuged, the precipitate was taken, washed with 75 wt% ethanol aqueous solution and deionized water for 3 times, dried at 60°C for 72 h to obtain nanoparticles for standby;

[0055] 2) 15 g of xanthan gum was added to 300 ml of deionized water, stirred for 30 min, 3 g of nanoparticles of step 1) was added, stirred for 1 h, 0.3 g of gluconolactone was added, stirred for 30 min, stood at -20°C for 10 h, freeze-dried at -40°C for 24 h to obtain modified xanthan gum A.

[0056] Preparation Example 5

[0057] Modified xanthan gum B, the specific embodiment is the same as modified xanthan gum A, the difference is that the mass of 2-octyl-2, 3-dihydrothiophene [3, 4-B] [1, 4] dioxin in step 1) is replaced with 12g.

[0058] Preparation Example 6

[0059] Modified xanthan gum C, the specific embodiment is the same as modified xanthan gum A, the difference is that the mass of nanoparticles in step 2) is replaced with 1.2g.

[0060] Example 1

[0061] A synergistic dust cleaning and decoking dust suppressant, the synergistic dust cleaning and decoking dust suppressant includes the following raw materials in parts by weight: cerium oxide 12.5 parts, silicon carbide 5 parts, borax 7.5 parts, urea 5 parts, citric acid 9 parts, combustion improver 15 parts, modified activated clay A 30 parts, modified xanthan gum A 15 parts, carboxymethyl cellulose 15 parts, benzisothiazolinone 2 parts, and sodium dodecylbenzenesulfonate 1.25 parts.

[0062] The combustion improver is a mixture of barium nitrate and potassium permanganate with a mass ratio of 2.5:1.

[0063] The preparation method of the synergistic dust cleaning and decoking dust suppressant in this embodiment includes the following steps:

[0064] Mix cerium oxide, silicon carbide, borax, urea, citric acid, combustion improver, modified activated clay A, modified xanthan gum A, carboxymethyl cellulose, benzisothiazolinone, and sodium dodecylbenzenesulfonate, stir for 1h, dry at 60℃ for 24h, crush, and pass through a 40 mesh sieve to obtain the synergistic dust cleaning and decoking dust suppressant.

[0065] Example 2

[0066] A synergistic dust cleaning and decoking dust suppressant, the synergistic dust cleaning and decoking dust suppressant includes the following raw materials in parts by weight: cerium oxide 10 parts, silicon carbide 3 parts, borax 5 parts, urea 3 parts, tartaric acid 6 parts, combustion improver 10 parts, modified activated clay A 30 parts, modified xanthan gum A 10 parts, carboxymethyl cellulose 10 parts, benzisothiazolinone 1 part, and sodium dodecylbenzenesulfonate 0.5 part.

[0067] The combustion improver is a mixture of barium nitrate and potassium permanganate with a mass ratio of 2:1.

[0068] The preparation method of the synergistic dust cleaning and decoking dust suppressant in this embodiment includes the following steps:

[0069] cerium oxide, silicon carbide, borax, urea, tartaric acid, combustion improver, modified activated clay A, modified xanthan gum A, carboxymethyl cellulose, benzisothiazolinone and sodium dodecyl benzene sulfonate are mixed, stirred for 1 h, dried at 60℃ for 24 h, crushed, and passed through a 40 mesh sieve to obtain the synergistic soot cleaning and decoking dust suppression agent.

[0070] Example 3

[0071] A synergistic soot cleaning and decoking dust suppression agent, by weight fraction, includes the following raw materials: cerium oxide 15 parts, silicon carbide 7 parts, borax 10 parts, urea 7 parts, oxalic acid 12 parts, combustion improver 20 parts, modified activated clay A 30 parts, modified xanthan gum A 20 parts, carboxymethyl cellulose 20 parts, benzisothiazolinone 3 parts, and sodium dodecyl benzene sulfonate 2 parts.

[0072] The combustion improver is a mixture of barium nitrate and potassium permanganate with a mass ratio of 3:1.

[0073] The preparation method of the synergistic soot cleaning and decoking dust suppression agent in this embodiment includes the following steps:

[0074] cerium oxide, silicon carbide, borax, urea, oxalic acid, combustion improver, modified activated clay A, modified xanthan gum A, carboxymethyl cellulose, benzisothiazolinone and sodium dodecyl benzene sulfonate are mixed, stirred for 1 h, dried at 60℃ for 24 h, crushed, and passed through a 40 mesh sieve to obtain the synergistic soot cleaning and decoking dust suppression agent.

[0075] Example 4

[0076] A synergistic soot cleaning and decoking dust suppression agent, by weight fraction, includes the following raw materials: cerium oxide 11 parts, silicon carbide 4 parts, borax 6 parts, urea 4 parts, citric acid 7 parts, combustion improver 12 parts, modified activated clay A 25 parts, modified xanthan gum A 15 parts, carboxymethyl cellulose 12 parts, benzisothiazolinone 1.5 parts, and sodium dodecyl benzene sulfonate 1 part.

[0077] The combustion improver is a mixture of barium nitrate and potassium permanganate with a mass ratio of 2.5:1.

[0078] The preparation method of the synergistic soot cleaning and decoking dust suppression agent in this embodiment is the same as in Embodiment 1.

[0079] Example 5

[0080] The synergistic ash cleaning and decoking dust inhibitor comprises the following raw materials in parts by weight: 14 parts of cerium oxide, 6 parts of silicon carbide, 9 parts of borax, 6 parts of urea, 11 parts of citric acid, 19 parts of combustion improver, 35 parts of modified activated clay A, 15 parts of modified xanthan gum A, 19 parts of carboxymethyl cellulose, 2.5 parts of benzisothiazolinone, and 1.5 parts of sodium dodecyl benzene sulfonate.

[0081] The combustion improver is a mixture of barium nitrate and potassium permanganate, with a mass ratio of 2.5:1.

[0082] The preparation method of the synergistic ash cleaning and decoking dust inhibitor in this embodiment is the same as that in Embodiment 1.

[0083] Example 6

[0084] This embodiment provides a synergistic ash cleaning and decoking dust inhibitor and a preparation method thereof, and the specific implementation manner is the same as that in Embodiment 1, except that the modified activated clay B is used to replace the modified activated clay A in equal amount.

[0085] Example 7

[0086] This embodiment provides a synergistic ash cleaning and decoking dust inhibitor and a preparation method thereof, and the specific implementation manner is the same as that in Embodiment 1, except that the modified activated clay C is used to replace the modified activated clay A in equal amount.

[0087] Example 8

[0088] This embodiment provides a synergistic ash cleaning and decoking dust inhibitor and a preparation method thereof, and the specific implementation manner is the same as that in Embodiment 1, except that the modified xanthan gum B is used to replace the modified xanthan gum A in equal amount.

[0089] Example 9

[0090] This embodiment provides a synergistic ash cleaning and decoking dust inhibitor and a preparation method thereof, and the specific implementation manner is the same as that in Embodiment 1, except that the modified xanthan gum C is used to replace the modified xanthan gum A in equal amount.

[0091] Comparative Example 1

[0092] This comparative example provides a synergistic ash cleaning and decoking dust inhibitor and a preparation method thereof, and the specific implementation manner is the same as that in Embodiment 1, except that the activated clay is used to replace the modified activated clay A in equal amount.

[0093] Comparative Example 2

[0094] This comparative example provides a synergistic ash cleaning and decoking dust inhibitor and a preparation method thereof, and the specific implementation manner is the same as that in Embodiment 1, except that the xanthan gum is used to replace the modified xanthan gum A in equal amount.

[0095] Performance test

[0096] The ash removal and decoking performance and dust suppression performance of the synergistic ash removal and decoking dust suppressant of the above Examples 1-9 and Comparative Examples 1-2 were tested, and the test results are shown in Table 1.

[0097] (1) Ash removal and decoking performance

[0098] The same amount of the synergistic ash removal and decoking dust suppressant of the above examples and comparative examples was added to the boiler, and the ash removal and decoking rate was tested, wherein the weight of the boiler was W1, the boiler was normally used, and was calcined at 1200℃ for 1 hour, the weight was W2, the synergistic ash removal and decoking dust suppressant of the examples and comparative examples of the present application was sprinkled on the boiler (the mass of the synergistic ash removal and decoking dust suppressant was 0.005% of the daily combustion amount of the boiler), and was placed at room temperature for two hours, then was rinsed with a sponge under the flow of 40℃ hot water, and was dried at 60℃ for 24h, the weight was W3, and the ash removal and decoking rate was obtained by gravimetric method.

[0099] Ash removal and decoking rate (%) = (W2-W3) / (W2-W1) x 100%.

[0100] (2) Dust suppression performance

[0101] The synergistic ash removal and decoking dust suppressant of the above examples and comparative examples was mixed with water in a mass ratio of 1:500, and then was sprayed on the road surface, and the PM 10 Dust suppression efficiency, referring to the test method of dust suppression efficiency in Appendix A of T / CAEPI 7-2017 “Water-soluble road dust suppressant”, wherein the test temperature was 25℃, and the relative humidity was 45%.

[0102] Table 1

[0103]

[0104]

[0105] From the data in Table 1, the synergistic ash removal and decoking and dust suppression agent in embodiments 1-5 has good ash removal and decoking performance and dust suppression performance. Among them, embodiments 6-7 change the addition ratio of diethylenetriamine propyl trimethoxysilane and carboxymethyl chitosan in the synthesis process of modified activated clay, so that the adsorption and structural stability of the modified activated clay are not well improved, and then the ash removal and decoking performance of the synergistic ash removal and decoking and dust suppression agent is significantly reduced, but the dust suppression performance is not affected; embodiments 8-9 change the addition ratio of key ingredients during the preparation of modified xanthan gum, so that the heat resistance of the modified xanthan gum is not well improved, and then the dust suppression performance of the synergistic ash removal and decoking and dust suppression agent is significantly reduced, and the ash removal and decoking performance also decreases to some extent; comparative example 1 and comparative example 2 respectively use activated clay and xanthan gum to replace modified activated clay A and modified xanthan gum A in equal amounts, and test shows that the ash removal and decoking and dust suppression agent has poor ash removal and decoking performance and dust suppression performance.

[0106] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application, and any equivalent changes or modifications made according to the spirit and essence of the present application should be covered within the protection scope of the present application.

Claims

1. A synergistic soot cleaning and decoking suppressant, characterized in that, The synergistic ash cleaning, decoking and dust suppressing agent comprises, by weight, cerium oxide 10-15 parts, silicon carbide 3-7 parts, borax 5-10 parts, urea 3-7 parts, carboxylic acid 6-12 parts, combustion improver 10-20 parts, modified activated clay 25-35 parts, modified xanthan gum 10-20 parts, carboxymethyl cellulose 10-20 parts, preservative 1-3 parts, and sodium dodecyl benzene sulfonate 0.5-2 parts. The preparation method of the modified activated clay comprises the following steps: (1) mixing diethylenetriamine propyl trimethoxysilane and toluene, stirring, transferring to a reaction container, adding activated clay, heating to 75-85°C, stirring, cooling to room temperature, centrifuging, washing, drying, and cooling to room temperature to obtain the product for standby use; (2) mixing chitosan and isopropyl alcohol, stirring, adding sodium hydroxide aqueous solution, stirring, adding chloroacetic acid, heating to 55-65°C, stirring, cooling to room temperature, washing, standing, removing the upper solution, adding anhydrous ethanol, suction filtering, washing, and drying to obtain carboxymethyl chitosan for standby use; (3) taking the carboxymethyl chitosan of step (2), adding acetic acid aqueous solution, stirring, adding the product of step (1), heating to 55-65°C, stirring, suction filtering, and drying to obtain the modified activated clay; In step (1), the mass ratio of activated clay to diethylenetriamine propyl trimethoxysilane is 1:(0.2-0.4); In step (3), the mass ratio of product to carboxymethyl chitosan is 1:(0.05-0.2); The preparation method of the modified xanthan gum comprises the following steps: 1) adding 2-octyl-2,3-dihydrothiopheno[3,4-B][1,4]dioxin to hyaluronic acid aqueous solution, stirring, passing in inert gas, dropwise adding ammonium persulfate aqueous solution, stirring for 11-13h, washing, centrifuging, taking the precipitate, washing, and drying to obtain nanoparticles for standby use; 2) adding xanthan gum to deionized water, stirring, adding the nanoparticles of step 1), stirring, adding gluconolactone, stirring, standing at -25~-15°C for 8-10h, and freeze-drying to obtain the modified xanthan gum; In step 1), the mass ratio of 2-octyl-2,3-dihydrothiopheno[3,4-B][1,4]dioxin to hyaluronic acid in hyaluronic acid aqueous solution is 1:(2.5-3); In step 2), the mass ratio of xanthan gum to nanoparticles is 1:(0.1-0.3).

2. The synergistic soot cleaning decoking dust suppressant of claim 1, wherein, The carboxylic acid is any one of citric acid, tartaric acid, oxalic acid, and acetic acid.

3. The synergistic soot cleaning decoking dust suppressant of claim 1, wherein, The combustion improver is a mixture of barium nitrate and potassium permanganate.

4. A process for the preparation of the synergistic soot cleaning and decoking dust suppressant as claimed in any one of claims 1 to 3, characterized in that, The method comprises the following steps: Mixing cerium oxide, silicon carbide, borax, urea, carboxylic acid, combustion improver, modified activated clay, modified xanthan gum, carboxymethyl cellulose, preservative, and sodium dodecyl benzene sulfonate, stirring, drying, crushing, sieving, and obtaining the synergistic ash cleaning, decoking and dust suppressing agent.

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