Synergistic deashing and decoking dust suppressant and preparation method thereof

Abstract

The invention relates to the field of energy conservation and environmental protection, and provides a synergistic ash removal and decoking dust suppressant and a preparation method thereof.The synergistic ash removal and decoking dust suppressant is prepared from, 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 combustion improver, 25-35 parts of modified activated clay and 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 removal and decoking dust suppressant provided by the invention has efficient ash removal and decoking as well as dust suppression functions, and has better commercial application value.

Description

Technical Field

[0001] The invention relates to the field of energy conservation and environmental protection, and in particular to a synergistic dust-cleaning and de-coking dust suppressant and a preparation method thereof. Background Art

[0002] During the coal combustion process of coal-fired boilers, coking easily occurs on the heating surface of water-cooled wall pipes, and dust is easily accumulated on the superheater and reheater pipes, which will lead to a decrease in boiler heat exchange efficiency, an increase in exhaust gas temperature, and an increase in energy consumption. In addition, the heating surface of the pipes is prone to sulfate corrosion due to severe coking, which shortens the service life of the boiler. These problems will seriously affect the safe and economic operation of the boiler. In addition, coal always contains carbon, sulfur, moisture and other mineral impurities. The sulfur dioxide and nitrogen oxides contained in the flue gas generated during the combustion process will also pollute the air. In addition, during the transportation of coal, the mine dust contains a variety of heavy metals, and the floating dust can absorb various toxic substances. The floating dust adsorbing toxic substances floats everywhere, seriously polluting the environment on which we depend.

[0003] At present, for the deashing and coking problems of industrial boilers and large-scale station boilers, two methods are usually adopted: stopping the furnace for manual deashing and coking or using chemical deashing and coking agents. Compared with manual deashing and coking, adding specific chemical agents, namely chemical deashing and degumming agents, into the boiler reacts with substances in the ash to remove ash and coking on the heated surface, and plays a dual effect of removal and prevention, which can ensure the safe and economical operation of the boiler. However, there are not many deashing and deashing agents with dust suppression performance on the market, 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 functions in deashing and deashing agents, 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 in the application include modified starch, carboxymethyl cellulose, xanthan gum, guar gum, potassium sulfate, sodium sulfate, magnesium sulfate, hydroxypropyl methylcellulose and surfactants, which can bond and consolidate the dust on the surface of bare soil and effectively suppress the dust phenomenon occurring 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 in the market for an enhanced dust cleaning, de-ashing and dust suppression agent that has both efficient dust cleaning, de-ashing and dust suppression functions. Summary of the invention

[0006] In view of the problems existing in the prior art, the present invention synthesizes a synergistic dust cleaning and de-coking dust suppressant with cerium oxide, modified activated clay and modified xanthan gum as main components, which has both efficient dust cleaning and de-coking and dust suppression functions.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] On one hand, the present invention provides a synergistic dust-cleaning and de-scorching dust suppressant, which comprises the following raw materials in parts 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 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 dodecylbenzene sulfonate.

[0009] Wherein, the preservative is benzisothiazolinone.

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

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

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

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

[0014] In some embodiments of the present invention, the method for preparing the modified activated clay comprises the following steps:

[0015] (1) diethylenetriaminopropyltrimethoxysilane and toluene are mixed, stirred and transferred to a reaction vessel, activated clay is added, heated to 75-85° C., stirred, cooled to room temperature, centrifuged, washed, dried, and cooled to room temperature to obtain a product for use;

[0016] (2) mixing chitosan and isopropanol, 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 layer solution, adding anhydrous ethanol, filtering, washing, drying, and obtaining carboxymethyl chitosan for use;

[0017] (3) Take the carboxymethyl chitosan of step (2), add acetic acid aqueous solution, stir, add the product of step (1), heat to 55-65° C., stir, filter, and dry to obtain modified activated clay.

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

[0019] In some embodiments of the present invention, in step (1), the mass ratio of activated clay to diethylenetriaminopropyltrimethoxysilane is 1:(0.2-0.4).

[0020] Preferably, in step (1), the mass ratio of activated clay to diethylenetriaminopropyltrimethoxysilane is 1:0.33.

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

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

[0023] Activated clay can be used as an adsorbent for cleaning and decoking due to its microporous structure and large specific surface area. It can also be used as a carrier of cerium oxide, a catalytic component in enhanced cleaning and decoking dust suppressants, thereby promoting cleaning and decoking. However, the adsorption capacity of activated clay is limited, resulting in its adsorption effect being less than ideal, which in turn leads to limited cleaning and decoking performance.

[0024] The applicant first uses diethylenetriaminopropyltrimethoxysilane to organically modify the activated clay. The diethylenetriaminopropyltrimethoxysilane molecules enter the interlayer of the activated clay, thereby stripping the activated clay structure to obtain the product, increasing the specific surface area and looseness of the activated clay, thereby improving the adsorption of the activated clay, and thereby improving the dust-cleaning and decoking effects of the activated clay; further, the applicant uses chloroacetic acid to modify chitosan to prepare carboxymethyl chitosan, and uses carboxymethyl chitosan and the product to composite, so that the carboxymethyl chitosan is embedded in the lamellar structure of the product, thereby improving the structural stability of the modified activated clay, solving the problem that the activated clay lamellar layer is prone to collapse and thus leading to a decrease in adsorption performance, and further improving the dust-cleaning and decoking effects of the modified activated clay.

[0025] In some embodiments of the present invention, the method for preparing the modified xanthan gum comprises the following steps:

[0026] 1) adding 2-octyl-2,3-dihydrothieno[3,4-B][1,4]dioxin to a hyaluronic acid aqueous solution, stirring, introducing an inert gas, dropping an ammonium persulfate aqueous solution, stirring for 11-13 hours, washing, centrifuging, collecting a precipitate, washing, and drying to obtain nanoparticles for later use;

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

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

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

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

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

[0032] Currently, there are not many de-ashing and dust-suppression agents on the market that also have dust suppression properties. Xanthan gum, as a microbial extracellular polysaccharide, can increase the overall viscosity of the de-ashing and dust-suppression agent and improve the adhesion of the de-ashing and dust-suppression agent on the surface of objects, thereby achieving a dust suppression effect. However, as a natural polymer substance, xanthan gum still has certain limitations in its heat resistance.

[0033] The applicant selected 2-octyl-2,3-dihydrothieno[3,4-B][1,4] dioxin as a raw material, obtained nanoparticles by doping with hyaluronic acid, and then introduced the nanoparticles into a xanthan gum matrix to prepare modified xanthan gum. On the one hand, 2-octyl-2,3-dihydrothieno[3,4-B][1,4] dioxin introduced alkyl long chains and thiophene ring structures into the structure of the modified xanthan gum, thereby 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 introduced cross-linking sites into the xanthan gum, thereby forming a stable network structure inside the modified xanthan gum, thereby further improving the thermal stability of the modified xanthan gum.

[0034] Another aspect of the present invention further provides a method for preparing the synergistic dust removal and deslagging agent described in the above technical solution, comprising the following steps:

[0035] The cerium oxide, silicon carbide, borax, urea, carboxylic acid, combustion improver, modified activated clay, modified xanthan gum, carboxymethyl cellulose, preservative and sodium dodecylbenzene sulfonate are mixed, stirred, dried, crushed and sieved to obtain a synergistic dust removal and deashing agent.

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

[0037] (1) The present invention synthesizes a synergistic cleaning and descorching dust suppressant with cerium oxide, modified activated clay and modified xanthan gum as main components. Through the synergistic effect of the components, the synergistic cleaning and descorching dust suppressant has both high-efficiency cleaning and descorching and dust suppression functions.

[0038] (2) The present invention first uses diethylenetriaminopropyltrimethoxysilane to organically modify the activated clay, and then introduces carboxymethyl chitosan to synthesize the modified activated clay, thereby improving the adsorption and structural stability of the activated clay, thereby improving the dust removal and decoking effect of the activated clay.

[0039] (3) The present invention uses 2-octyl-2,3-dihydrothieno[3,4-B][1,4]dioxin as a raw material, obtains nanoparticles by doping with hyaluronic acid, and then introduces the nanoparticles into a xanthan gum matrix to prepare modified xanthan gum, thereby effectively improving the thermal stability of the xanthan gum.

[0040] (4) The synergistic cleaning and de-ashing dust suppressant prepared by the present invention has both high-efficiency cleaning and de-ashing and dust suppression functions, and can be widely used in boiler cleaning and de-ashing, construction site dust suppression, railway and coal mine dust suppression fields, and has good commercial application value. DETAILED DESCRIPTION

[0041] The present invention will be described below in conjunction with specific embodiments. It should be noted that the following embodiments are examples of the present invention and are only used to illustrate the present invention, but not to limit the present invention. Other combinations and various modifications within the concept of the present invention may be performed without departing from the spirit or scope of the present invention.

[0042] In the following examples and comparative examples, except for modified activated clay and modified xanthan gum, the other compound monomers and related reagents used can be purchased from the market. Among them, activated clay was purchased from Tianjin Yandong Haotian Mineral Products Co., Ltd.; chitosan was purchased from Shaanxi Rankang Biotechnology Co., Ltd.; and carboxymethyl cellulose was purchased from Jinan Mingjiang Chemical Co., Ltd.

[0043] Preparation Example 1

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

[0045] (1) 1 g of diethylenetriaminopropyltrimethoxysilane and 20 ml of toluene were mixed, stirred for 15 min, and then transferred to a polytetrafluoroethylene reaction container, 3 g of activated clay was added, heated to 80° C., stirred for 4 h, cooled to room temperature, centrifuged, washed with acetone 3 times, dried at 100° C. for 12 h, and cooled to room temperature to obtain the product for use;

[0046] (2) 1 g of chitosan was mixed with 30 ml of isopropanol, stirred for 1 h, 10 ml of 35 wt% sodium hydroxide aqueous 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, allowed to stand for 8 h, the upper layer of solution was removed, 40 ml of anhydrous ethanol was added, filtered, washed with deionized water 3 times, and dried at 60° C. for 24 h to obtain carboxymethyl chitosan for use;

[0047] (3) Take 0.5 g of the carboxymethyl chitosan prepared in step (2), add 1 wt % acetic acid aqueous solution to adjust the pH to 5, stir for 1 h, add 5 g of the product prepared in step (1), heat to 60° C., stir for 6 h, filter with suction, and dry at 60° C. for 24 h to obtain modified activated clay A.

[0048] Preparation Example 2

[0049] The specific implementation method of modified activated clay B is the same as that of modified activated clay A, except that in step (1), the mass of diethylenetriaminopropyltrimethoxysilane is replaced with 0.4 g.

[0050] Preparation Example 3

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

[0052] Preparation Example 4

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

[0054] 1) Add 12.7 g of 2-octyl-2,3-dihydrothieno[3,4-B][1,4]dioxin to 300 ml of 0.125 g / ml hyaluronic acid aqueous solution, stir for 30 min, introduce nitrogen for 30 min, dropwise add 20 ml of 0.015 mol / L ammonium persulfate aqueous solution, stir for 12 h, wash with 100 ml of acetone, centrifuge, take the precipitate, wash with 75 wt% ethanol aqueous solution and deionized water three times in sequence, dry at 60° C. for 72 h, and obtain nanoparticles for use;

[0055] 2) Add 15 g of xanthan gum to 300 ml of deionized water, stir for 30 min, add 3 g of the nanoparticles prepared in step 1), stir for 1 h, add 0.3 g of gluconolactone, stir for 30 min, let stand at -20 ° C for 10 h, and freeze-dry at -40 ° C for 24 h to obtain modified xanthan gum A.

[0056] Preparation Example 5

[0057] The specific implementation method of modified xanthan gum B is the same as that of modified xanthan gum A, except that in step 1), the mass of 2-octyl-2,3-dihydrothieno[3,4-B][1,4]dioxin is replaced with 12 g.

[0058] Preparation Example 6

[0059] The specific implementation method of modified xanthan gum C is the same as that of modified xanthan gum A, except that in step 2), the mass of the nanoparticles is replaced with 1.2 g.

[0060] Example 1

[0061] A synergistic dust-cleaning and de-scorching dust suppressant comprises the following raw materials, measured by weight: 12.5 parts of cerium oxide, 5 parts of silicon carbide, 7.5 parts of borax, 5 parts of urea, 9 parts of citric acid, 15 parts of combustion improver, 30 parts of modified activated clay A, 15 parts of modified xanthan gum A, 15 parts of carboxymethyl cellulose, 2 parts of benzisothiazolinone and 1.25 parts of sodium dodecylbenzene sulfonate.

[0062] The combustion aid 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 removal and deslagging agent in this embodiment comprises the following steps:

[0064] Cerium oxide, silicon carbide, borax, urea, citric acid, combustion improver, modified activated clay A, modified xanthan gum A, carboxymethyl cellulose, benzisothiazolinone and sodium dodecylbenzene sulfonate are mixed, stirred for 1 hour, dried at 60°C for 24 hours, crushed, and passed through a 40-mesh sieve to obtain a synergistic ash-removing and de-scorching dust suppressant.

[0065] Example 2

[0066] A synergistic dust-cleaning and de-scorching dust suppressant comprises the following raw materials, measured by weight: 10 parts of cerium oxide, 3 parts of silicon carbide, 5 parts of borax, 3 parts of urea, 6 parts of tartaric acid, 10 parts of combustion aid, 30 parts of modified activated clay A, 10 parts of modified xanthan gum A, 10 parts of carboxymethyl cellulose, 1 part of benzisothiazolinone and 0.5 parts of sodium dodecylbenzene sulfonate.

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

[0068] The preparation method of the synergistic dust removal and deslagging agent in this embodiment comprises 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 dodecylbenzene sulfonate are mixed, stirred for 1 hour, dried at 60°C for 24 hours, crushed, and passed through a 40-mesh sieve to obtain a synergistic dust-removing and deashing dust suppressant.

[0070] Example 3

[0071] A synergistic dust-cleaning and de-scorching dust suppressant comprises the following raw materials, measured by weight: 15 parts of cerium oxide, 7 parts of silicon carbide, 10 parts of borax, 7 parts of urea, 12 parts of oxalic acid, 20 parts of combustion improver, 30 parts of modified activated clay A, 20 parts of modified xanthan gum A, 20 parts of carboxymethyl cellulose, 3 parts of benzisothiazolinone and 2 parts of sodium dodecylbenzene sulfonate.

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

[0073] The preparation method of the synergistic dust removal and deslagging agent in this embodiment comprises 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 dodecylbenzene sulfonate are mixed, stirred for 1 hour, dried at 60°C for 24 hours, crushed, and passed through a 40-mesh sieve to obtain a synergistic dust-removing and deashing agent.

[0075] Example 4

[0076] A synergistic dust-cleaning and de-scorching dust suppressant comprises the following raw materials, measured by weight: 11 parts of cerium oxide, 4 parts of silicon carbide, 6 parts of borax, 4 parts of urea, 7 parts of citric acid, 12 parts of combustion aid, 25 parts of modified activated clay A, 15 parts of modified xanthan gum A, 12 parts of carboxymethyl cellulose, 1.5 parts of benzisothiazolinone and 1 part of sodium dodecylbenzene sulfonate.

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

[0078] The preparation method of the synergistic dust removal and deashing agent in this embodiment is the same as that in Example 1.

[0079] Example 5

[0080] A synergistic dust-cleaning and de-scorching dust suppressant comprises the following raw materials, measured 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 aid, 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 dodecylbenzene sulfonate.

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

[0082] The preparation method of the synergistic dust removal and deashing agent in this embodiment is the same as that in Example 1.

[0083] Example 6

[0084] This embodiment provides a synergistic dust-cleaning and deslagging agent and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that modified activated clay B replaces modified activated clay A in equal amounts.

[0085] Example 7

[0086] This embodiment provides a synergistic dust-cleaning and deslagging agent and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that modified activated clay C replaces modified activated clay A in equal amounts.

[0087] Example 8

[0088] This embodiment provides a synergistic dust-cleaning and descorching dust suppressant and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that modified xanthan gum B replaces modified xanthan gum A in equal amounts.

[0089] Example 9

[0090] This embodiment provides a synergistic dust-clearing and descorching dust suppressant and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that modified xanthan gum C replaces modified xanthan gum A in equal amounts.

[0091] Comparative Example 1

[0092] This comparative example provides a synergistic dust-cleaning and deslagging agent and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that an equal amount of activated clay is used to replace the modified activated clay A.

[0093] Comparative Example 2

[0094] This comparative example provides a synergistic dust-cleaning and deslagging agent and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that an equal amount of xanthan gum is used to replace modified xanthan gum A.

[0095] Performance Testing

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

[0097] (1) Cleaning and de-ashing performance

[0098] The same amount of the synergistic cleaning, de-ashing and dust suppression agents of the above-mentioned embodiment and comparative example were respectively added to the boiler to test the cleaning and de-ashing rate, wherein the boiler was measured as W1, and the boiler was used normally. It was roasted at 1200°C for 1 hour and the weight was measured as W2. The synergistic cleaning, de-ashing and dust suppression agents of the embodiment of the present invention and the comparative example were sprinkled on the boiler (the mass of the synergistic cleaning, de-ashing and dust suppression agents was 0.05 ten-thousandth of the daily combustion amount of the boiler), left at room temperature for two hours, then rinsed with a sponge under flowing hot water at 40°C, dried at 60°C for 24 hours, and weighed as W3. The cleaning and de-ashing rate was obtained by the weight method.

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

[0100] (2) Dust suppression performance

[0101] The synergistic dust removal and deslagging agent of the above embodiment and the comparative example were mixed with water at a mass ratio of 1:500, and then sprayed on the road surface to test PM 10 Dust suppression efficiency, refer to the dust suppression efficiency detection method in Appendix A of T / CAEPI 7-2017 "Water-soluble Road Dust Suppressants", where the test temperature is 25°C and the relative humidity is 45%.

[0102] Table 1

[0103]

[0104]

[0105] It can be seen from the data in Table 1 that the synergistic dust removal and deslagging agent in Examples 1-5 of the present invention has good overall dust removal and deslagging performance and dust suppression performance. Among them, Examples 6-7 respectively changed the addition ratio of diethylenetriaminepropyltrimethoxysilane and carboxymethyl chitosan in the synthesis process of modified activated clay, so that the adsorption and structural stability of the modified activated clay were not well improved, which led to a significant decrease in the dust removal and deslagging performance of the synergistic dust removal and deslagging agent, but had little effect on the dust suppression performance; Examples 8-9 changed the addition ratio of key components in the preparation of modified xanthan gum, so that the heat resistance of the modified xanthan gum was not well improved, which led to a significant decrease in the dust suppression performance of the synergistic dust removal and deslagging agent, and the dust removal and deslagging performance also decreased to a certain extent; Comparative Examples 1 and Comparative Examples 2 respectively selected activated clay and xanthan gum to replace modified activated clay A and modified xanthan gum A in equal amounts, and the test found that the dust removal and deslagging performance and dust suppression performance of the synergistic dust removal and deslagging agent showed poor results.

[0106] The above implementation modes are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A synergistic dust removal and deslagging agent, characterized in that: The synergistic ash cleaning and decoking dust suppressant comprises the following raw materials 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 combustion aid, 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 dodecylbenzene sulfonate.

2. The synergistic dust removal and deslagging agent according to claim 1, characterized in that: The carboxylic acid is any one of citric acid, tartaric acid, oxalic acid and acetic acid.

3. The synergistic dust removal and deslagging agent according to claim 1, characterized in that: The combustion improver is a mixture of barium nitrate and potassium permanganate.

4. The synergistic dust removal and deslagging agent according to claim 1, characterized in that: The preparation method of the modified activated clay comprises the following steps: (1) diethylenetriaminopropyltrimethoxysilane and toluene are mixed, stirred and transferred to a reaction vessel, activated clay is added, heated to 75-85° C., stirred, cooled to room temperature, centrifuged, washed, dried, and cooled to room temperature to obtain a product for use; (2) mixing chitosan and isopropanol, 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 layer solution, adding anhydrous ethanol, filtering, washing, drying, and obtaining carboxymethyl chitosan for use; (3) Take the carboxymethyl chitosan of step (2), add acetic acid aqueous solution, stir, add the product of step (1), heat to 55-65° C., stir, filter, and dry to obtain modified activated clay.

5. The synergistic dust-clearing and descorching dust suppressant according to claim 4, characterized in that: In the step (1), the mass ratio of activated clay to diethylenetriaminopropyltrimethoxysilane is 1:(0.2-0.4).

6. The synergistic dust removal and deslagging agent according to claim 4, characterized in that: In the step (3), the mass ratio of the product to carboxymethyl chitosan is 1:(0.05-0.2).

7. The synergistic dust removal and deslagging agent according to claim 1, characterized in that: The preparation method of the modified xanthan gum comprises the following steps: 1) adding 2-octyl-2,3-dihydrothieno[3,4-B][1,4]dioxin to a hyaluronic acid aqueous solution, stirring, introducing an inert gas, dropping an ammonium persulfate aqueous solution, stirring for 11-13 hours, washing, centrifuging, collecting a precipitate, washing, and drying to obtain nanoparticles for later use; 2) Add xanthan gum to deionized water, stir, add the nanoparticles in step 1), stir, add gluconolactone, stir, let stand at -25 to -15°C for 8 to 10 hours, and freeze-dry to obtain modified xanthan gum.

8. The synergistic dust-clearing and descorching dust suppressant according to claim 7, characterized in that: In the step 1), the mass ratio of 2-octyl-2,3-dihydrothieno[3,4-B][1,4]dioxin to the hyaluronic acid in the hyaluronic acid aqueous solution is 1:(2.5-3).

9. The synergistic dust-clearing and descorching dust suppressant according to claim 7, characterized in that: In the step 2), the mass ratio of xanthan gum to nanoparticles is 1:(0.1-0.3).

10. A method for preparing the synergistic dust-cleaning and descorching dust suppressant according to any one of claims 1 to 9, characterized in that: The following steps are involved: The cerium oxide, silicon carbide, borax, urea, carboxylic acid, combustion improver, modified activated clay, modified xanthan gum, carboxymethyl cellulose, preservative and sodium dodecylbenzene sulfonate are mixed, stirred, dried, crushed and sieved to obtain a synergistic dust removal and deashing agent.

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