Combustion-supporting and corrosion-resistant colloidal magnesium-based heavy oil additive and its preparation method

Abstract

The application discloses a combustion-supporting and corrosion-preventing type colloidal magnesium-based heavy oil additive and a preparation method thereof. The heavy oil additive is prepared from the following components in parts by weight: magnesium oxide 50-80 parts, bentonite 10-15 parts, lime powder 5-10 parts, nano silicon dioxide 10-15 parts, basic copper chloride 5-10 parts, diaspore powder 10-15 parts, sodium dodecyl benzene sulfonate 2-8 parts, hydrocarbon solvent 2-8 parts, combustion-supporting dispersant 2-8 parts, and water 80-100 parts. The additive can inhibit the combustion of sulfur in the heavy oil to generate sulfur oxides, low-temperature sulfur corrosion and the synergistic corrosion of HCl. In the low-temperature section, the basic components such as lime powder react with HCl to generate salt compounds, neutralize the acidic substances in the flue gas, and significantly increase the pH value to above 8, thereby preventing the low-temperature dew point corrosion of the tail heating surface.

Description

Technical Field

[0001] This invention belongs to the field of heavy oil additive technology, and more specifically, relates to a combustion-supporting and corrosion-preventing colloidal magnesium-based heavy oil additive and its preparation method. Background Technology

[0002] Fuel oil, especially heavy oil, is an essential energy source for industrial boilers and marine propulsion, as a crucial product of crude oil processing. However, fuel oil typically exhibits high viscosity, high molecular weight, and complex composition, leading to problems such as poor atomization and incomplete combustion during combustion. This not only wastes energy and clogs equipment but also causes serious environmental pollution. In particular, the combustion process of fuel oil presents two major corrosion challenges: firstly, the vanadium and other metallic elements commonly found in fuel oil generate low-melting-point vanadium pentoxide (vanadium oxide) upon combustion. Compounds such as vanadium oxide (vanadium oxide) can adhere to the high-temperature heating surfaces of boilers and other equipment, damaging the protective oxide film on the metal surface and causing high-temperature vanadium corrosion. Secondly, sulfur generated during the combustion of fuel oil... exist Further oxidation under catalysis to When sulfuric acid combines with water vapor in flue gas to form sulfuric acid vapor, and this vapor condenses on the surfaces of low-temperature components such as economizers and air preheaters when the flue gas temperature drops below the acid dew point, it causes severe low-temperature dew point corrosion. Furthermore, the HCl produced by the hydrolysis of sodium salts also exacerbates synergistic corrosion. Currently, using magnesium-based additives to neutralize acidic substances and increase the ash melting point is the most economical and widespread technical measure to suppress both high-temperature and low-temperature corrosion.

[0003] To address the aforementioned issues, various fuel oil additives have been developed in the prior art. However, traditional additives often have limited functionality or significant deficiencies in performance and stability, making it difficult to simultaneously meet the dual requirements of efficient combustion improvement and comprehensive corrosion prevention. For example, Chinese patent CN101705121A discloses an oil-soluble energy-saving and smoke-reducing heavy oil additive. This technology aims to lower the ignition point of heavy oil and catalyze the oxidation of carbon deposits by mixing and grinding rare earth powder, copper oxide catalyst, and other components with a dispersant in engine oil, thereby achieving an energy-saving and smoke-reducing combustion-improving effect. However, this type of technical solution has a fundamental flaw: firstly, the magnesium oxide content in its formulation is extremely low, serving only as a trace dehydrating agent, and it completely lacks the ability to react with large quantities of generated fuel oil. and The additive lacks the ability to react, thus failing to address the two core corrosion problems: high-temperature vanadium corrosion and low-temperature acid dew point corrosion. Secondly, the additive disperses solid powder in an organic solvent through simple physical mixing and grinding, forming an unstable suspension. After long-term storage or standing, the active ingredients are prone to agglomeration and sedimentation, leading to product failure. This non-colloidal structure severely limits its dispersion effect and duration of action in practical applications.

[0004] In summary, existing fuel oil additive technologies either focus on improving combustion while neglecting corrosion issues, or, although containing alkaline components, are ineffective due to poor dispersion stability. The market urgently needs a new type of additive that can both efficiently improve combustion and provide long-lasting corrosion protection, while also exhibiting excellent storage and usage stability. Therefore, developing a magnesium-based fuel oil additive that can form a stable colloidal system and possess both combustion-enhancing and corrosion-preventing properties through scientific formulation design and preparation processes has become a pressing technical challenge in this field. Summary of the Invention

[0005] To address the aforementioned deficiencies or improvement needs of existing technologies, this invention provides a combustion-supporting and corrosion-resistant colloidal magnesium-based heavy oil additive and its preparation method. This additive can inhibit the formation of sulfur oxides from sulfur combustion in heavy oil and the resulting low-temperature sulfur corrosion and synergistic corrosion by HCl. In the low-temperature range, alkaline components such as hydrated lime powder react with... The reaction with HCl produces salt compounds, which neutralize acidic substances in the flue gas, significantly increasing the pH value to above 8, thus preventing low-temperature dew point corrosion of the tail heating surface.

[0006] To achieve the above objectives, according to a first aspect of the present invention, a combustion-supporting and corrosion-preventing colloidal magnesium-based heavy oil additive is provided, comprising, by weight: 50-80 parts magnesium oxide, 10-15 parts clay, 5-10 parts lime powder, 10-15 parts nano silica, 5-10 parts basic copper chloride, 10-15 parts gibbsite powder, 2-8 parts surface modifier, 2-8 parts hydrocarbon solvent, 2-8 parts combustion-supporting dispersant, and 80-100 parts water.

[0007] The clay is bentonite, which is sodium-based or organically modified, with a cation exchange capacity ≥80 mmol / 100 g, interlayer spacing ≥1.5 nm and montmorillonite content ≥75 wt%, serving as a highly active ion exchange carrier material.

[0008] Furthermore, the hydrocarbon solvent is kerosene, diesel oil, or other petroleum fractions with similar properties. Kerosene and diesel oil serve as the core hydrocarbon solvents, with a distillation range covering 180~350℃ (kerosene 150~300℃, diesel oil 200~370℃), an aromatic content ≤25wt%, and enhanced heavy oil compatibility through non-polar carbon chains.

[0009] Furthermore, the surface modifier is sodium dodecylbenzenesulfonate, which can achieve the directional transformation of bentonite from hydrophilic to lipophilic, thereby improving the dispersion stability of the active component in heavy oil.

[0010] Furthermore, the combustion-promoting dispersant is oleic acid, linoleic acid, methyl oleate, sulfonic acid, or one or more of these, which can complex metal ions through carboxyl / sulfonic acid groups and self-assemble into a nano-catalytic membrane at the combustion interface, simultaneously achieving the cracking and activation of heavy oil macromolecules and the passivation of metal impurities.

[0011] Secondly, embodiments of the present invention provide a method for preparing a combustion-supporting and corrosion-preventing colloidal magnesium-based heavy oil additive, comprising the following steps:

[0012] S100: Weigh the components according to the weight ratio of magnesium oxide, bentonite, lime powder, nano silica, gibbsite powder and basic copper chloride to obtain the weighed components;

[0013] S200: Weigh the component, add 100 parts of water, stir and let stand at room temperature, remove the supernatant, repeat at least twice to obtain the washed solid;

[0014] S300: The washed solids are heated and dried until the moisture content is below 0.5% to obtain dried material;

[0015] S400: The dried material is crushed, graded and screened to collect micro powder with a particle size of less than 2 μm, and collected to obtain 100 parts;

[0016] S500: Collected micro powder, add 2-8 parts of sodium dodecylbenzenesulfonate, stir evenly, stir and heat to a certain temperature range, and then react at a constant temperature for a period of time to complete the surface modification and obtain mixture 1;

[0017] S600: Keep the temperature constant, add 2-8 parts of hydrocarbon solvent to mixture 1, and continue to stir and mix to obtain mixture 2;

[0018] S700: Wait for mixture 2 to cool at room temperature, then add 2-8 parts of combustion aid dispersant and 80-100 parts of water, stir and mix at a constant temperature to obtain mixture 3;

[0019] S800: Filter mixture 3 through an 8000-mesh sieve to obtain heavy oil additive.

[0020] In the above embodiments, the parts used are by weight.

[0021] Furthermore, in S200, the stirring time is 0.5~1 h and the settling time is 10~40 min.

[0022] Furthermore, in S300, the heating temperature range is 90~150℃.

[0023] Furthermore, in S500, the heating range and the isothermal reaction temperature range are 80–90°C.

[0024] Furthermore, in S500, the isothermal reaction time is 0.5~1 h.

[0025] Furthermore, in S600, the constant temperature range is 80~90℃.

[0026] Furthermore, in S600, the stirring time is 0.5~1h.

[0027] Furthermore, in S700, the temperature range for constant-temperature stirring after cooling to 50~60°C at room temperature and adding the combustion-supporting dispersant is 50~60°C.

[0028] Furthermore, in S700, the constant temperature stirring time after adding the combustion-supporting dispersant is 0.5~1 h.

[0029] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects:

[0030] 1. The additive of this invention can inhibit the formation of sulfur oxides from the combustion of sulfur in heavy oil and the resulting low-temperature sulfur corrosion and synergistic corrosion by HCl. In the low-temperature range, alkaline components such as hydrated lime powder react with... The reaction with HCl produces salt compounds, which neutralize acidic substances in the flue gas, significantly increasing the pH value to above 8, thus preventing low-temperature dew point corrosion of the tail heating surface.

[0031] 2. The additive of this invention can inhibit corrosion caused by high-temperature boiler steam and heavy oil rich in vanadium, sodium, and other metallic elements. In the high-temperature range, highly active magnesium oxide, basic copper chloride, and lime powder form a "Mg–Ca–Cu" multi-element vanadium-capturing system, which can... Transforming it into a high-melting-point composite basic vanadate solves the problem. High-temperature oxidation and corrosion problems.

[0032] 3. The additives of this invention can improve combustion efficiency and catalyze combustion to reduce smoke. The surface modifier promotes uniform mixing of oil and water, and after entering the combustion zone in the furnace, the fuel atomizes more evenly at high temperatures, improving the combustion efficiency of heavy oil. Nano-silica and basic copper chloride form active centers, which lower the ignition point temperature, increase the flame center temperature, improve the burnout rate, increase the average temperature of the radiant heating surface, improve boiler efficiency and output, and save 2-3% of fuel overall. Attached Figure Description

[0033] Figure 1This is a schematic diagram of the process for preparing a combustion-supporting and corrosion-resistant colloidal magnesium-based heavy oil additive and its preparation method according to an embodiment of the present invention.

[0034] Figure 2 This is a schematic diagram of a combustion-supporting and corrosion-resistant colloidal magnesium-based heavy oil additive according to an embodiment of the present invention.

[0035] Figure 3 This invention relates to a combustion-supporting and corrosion-resistant colloidal magnesium-based heavy oil additive that protects metals during use. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0037] This invention provides a combustion-supporting and corrosion-resistant colloidal magnesium-based heavy oil additive, comprising, by weight: 50-80 parts magnesium oxide, 10-15 parts clay, 5-10 parts lime powder, 10-15 parts nano-silica, 5-10 parts basic copper chloride, 10-15 parts gibbsite powder, 2-8 parts surface modifier, 2-8 parts hydrocarbon solvent, 2-8 parts combustion-supporting dispersant, and 80-100 parts water. This additive can inhibit the formation of sulfur oxides from the combustion of sulfur in heavy oil and the resulting low-temperature sulfur corrosion and synergistic corrosion by HCl. In the low-temperature range, the alkaline components such as lime powder react with... The reaction with HCl produces salt compounds, which neutralize acidic substances in the flue gas, significantly increasing the pH value to above 8, thus preventing low-temperature dew point corrosion of the tail heating surface.

[0038] The clay is bentonite, which is sodium-based or organically modified, with a cation exchange capacity ≥80 mmol / 100 g, interlayer spacing ≥1.5 nm and montmorillonite content ≥75 wt%, serving as a highly active ion exchange carrier material.

[0039] Furthermore, the hydrocarbon solvent is kerosene, diesel oil, or other petroleum fractions with similar properties. Kerosene and diesel oil serve as the core hydrocarbon solvents, with a distillation range covering 180~350℃ (kerosene 150~300℃, diesel oil 200~370℃), an aromatic content ≤25wt%, and enhanced heavy oil compatibility through non-polar carbon chains.

[0040] Furthermore, the surface modifier is sodium dodecylbenzenesulfonate, which can achieve the directional transformation of bentonite from hydrophilic to lipophilic, thereby improving the dispersion stability of the active component in heavy oil.

[0041] Furthermore, the combustion-promoting dispersant is oleic acid, linoleic acid, methyl oleate, sulfonic acid, or one or more of these, which can complex metal ions through carboxyl / sulfonic acid groups and self-assemble into a nano-catalytic membrane at the combustion interface, simultaneously achieving the cracking and activation of heavy oil macromolecules and the passivation of metal impurities.

[0042] Furthermore, embodiments of the present invention provide a method for preparing a combustion-supporting and corrosion-preventing colloidal magnesium-based heavy oil additive, comprising the following steps:

[0043] S100: Weigh magnesium oxide, bentonite, lime powder, nano silica, gibbsite powder and basic copper chloride according to the above proportions.

[0044] S200: Weigh the component and add it to a beaker. Then add 100 parts of water to the beaker, stir and let stand at room temperature, decant the supernatant, and repeat several times.

[0045] S300: The solid obtained after washing is spread into a thin layer of a certain thickness, placed in a rotary dryer, and dried by heating with an electric heating tray to reduce the moisture content to below 0.5%;

[0046] S400: The dried material is pulverized by a ball mill and then graded and screened using an 8000-mesh vibrating screen to collect micro powder with a particle size of less than 2 μm, which is collected in 100 portions.

[0047] S500: The collected micro powder is put into a constant temperature magnetic stirrer, 2-8 parts of sodium dodecylbenzenesulfonate are added, and the mixture is stirred evenly. After stirring and heating to a certain temperature range, the mixture is kept at a constant temperature for a period of time to complete the surface modification and obtain mixture 1.

[0048] S600: Keep the temperature constant, add 2-8 parts of hydrocarbon solvent to mixture 1, and continue to stir and mix to obtain mixture 2;

[0049] S700: Wait for mixture 2 to cool at room temperature, then add 2-8 parts of combustion aid dispersant and 80-100 parts of water, stir and mix at a constant temperature to obtain mixture 3;

[0050] S800: The mixture 3 is filtered through an 8000-mesh sieve to obtain a microemulsion system, which is the heavy oil additive of the present invention.

[0051] Furthermore, in S200, the stirring time is 0.5~1 h and the settling time is 10~40 min.

[0052] Furthermore, in S300, the heating temperature range is 90~150℃.

[0053] Furthermore, in S500, the heating range and the isothermal reaction temperature range are 80–90°C.

[0054] Furthermore, in S500, the isothermal reaction time is 0.5~1 h.

[0055] Furthermore, in S600, the constant temperature range is 80~90℃.

[0056] Furthermore, in S600, the stirring time is 0.5~1 h.

[0057] Furthermore, in S700, the temperature range for constant-temperature stirring after cooling to 50~60°C at room temperature and adding the combustion-supporting dispersant is 50~60°C.

[0058] Furthermore, in S700, the constant temperature stirring time after adding the combustion-supporting dispersant is 0.5~1 h.

[0059] Example 1

[0060] This invention provides a combustion-supporting and corrosion-resistant colloidal magnesium-based heavy oil additive, comprising, by weight: 50 parts magnesium oxide, 10 parts bentonite, 5 parts lime powder, 10 parts nano silica, 10 parts diaspore powder, 5 parts basic copper chloride, 2 parts sodium dodecylbenzenesulfonate, 2 parts kerosene, 2 parts linoleic acid, and 80 parts water.

[0061] like Figure 1 As shown, this embodiment of the invention provides a method for preparing a combustion-supporting and corrosion-resistant colloidal magnesium-based heavy oil additive, comprising:

[0062] (1) Weigh magnesium oxide, bentonite, lime powder, nano silica, diaspore powder and basic copper chloride according to the weight composition of the additives.

[0063] (2) Weigh the components and add them to a 500 ml beaker. Then add 100 parts of water to the beaker, stir for 0.5 h, let stand for 10 min, decant the supernatant, and repeat 3 times.

[0064] (3) Spread the solid obtained after washing into a thin layer of 2 cm thickness, place it in a rotary dryer, and dry it by heating it to 120°C with an electric heating tray to reduce the moisture content to below 0.5%;

[0065] (4) The dried material is pulverized by a ball mill and then graded and screened by an 8000-mesh vibrating screen to collect micro powder with a particle size of less than 2 μm, and collected into 100 portions.

[0066] (5) The collected micro powder was put into a constant temperature magnetic stirrer, 2 parts of sodium dodecylbenzenesulfonate were added, stirred evenly, and the temperature was raised to 80°C. The reaction was kept at a constant temperature for 1 h to complete the surface modification and obtain mixture 1.

[0067] (6) Keep the temperature constant at 80℃, add 2 parts of kerosene to mixture 1, continue stirring for 0.5 h and mix well to obtain mixture 2;

[0068] (7) Wait for mixture 2 to cool to 50°C at room temperature, then add 2 parts of linoleic acid and 80 parts of water, and stir at a constant temperature of 50°C for 0.5 h to obtain mixture 3;

[0069] (8) The mixture 3 was filtered through an 8000-mesh sieve, and the resulting product was a grayish-white color, such as... Figure 2 As shown, the product has a uniform color and no layering.

[0070] Example 2

[0071] This invention provides a combustion-supporting and corrosion-resistant colloidal magnesium-based heavy oil additive, comprising, by weight: 65 parts magnesium oxide, 13 parts bentonite, 8 parts lime powder, 13 parts nano silica, 13 parts diaspore powder, 8 parts basic copper chloride, 5 parts sodium dodecylbenzenesulfonate, 5 parts kerosene, 5 parts linoleic acid, and 90 parts water.

[0072] The operation steps in this embodiment are basically the same as those in Embodiment 1, but the weight proportions are different. The final product is grayish-white with a uniform color and no layering.

[0073] Example 3

[0074] This invention provides a combustion-supporting and corrosion-resistant colloidal magnesium-based heavy oil additive, comprising, by weight: 70 parts magnesium oxide, 12 parts bentonite, 7 parts lime powder, 12 parts nano silica, 14 parts diaspore powder, 8 parts basic copper chloride, 8 parts sodium dodecylbenzenesulfonate, 8 parts kerosene, 8 parts linoleic acid, and 100 parts water.

[0075] The operation steps in this embodiment are basically the same as those in Embodiment 1, but the weight proportions are different. The final product is grayish-white with a uniform color and no layering.

[0076] Example 4

[0077] This invention provides a combustion-supporting and corrosion-resistant colloidal magnesium-based heavy oil additive, comprising, by weight: 80 parts magnesium oxide, 15 parts bentonite, 10 parts lime powder, 15 parts nano silica, 15 parts diaspore powder, 10 parts basic copper chloride, 4 parts sodium dodecylbenzenesulfonate, 6 parts kerosene, 7 parts linoleic acid, and 95 parts water.

[0078] The operation steps in this embodiment are basically the same as those in Embodiment 1, and the final product is grayish-white with uniform color and no layering.

[0079] Example 5

[0080] This invention provides a method for preparing a combustion-supporting and corrosion-resistant colloidal magnesium-based heavy oil additive. The preparation steps include: in step (2), the stirring time is 0.5 h and the standing time is 10 min; in step (3), the drying temperature is 90℃ and the moisture content is ≤0.5%; in step (5), the surface modification temperature is 80℃ and the reaction time is 0.5 h; in step (6), the mixing temperature is 80℃ and the stirring time is 0.5 h; in step (7), after cooling to 50℃, the combustion-supporting agent is added, the constant temperature stirring temperature is 50℃, and the stirring time is 0.5 h.

[0081] This embodiment has the same weight and components as Embodiment 2, the specific preparation steps are the same, but the specific operating parameters are different. The final product is grayish-white with uniform color and no layering.

[0082] Example 6

[0083] This invention provides a method for preparing a combustion-supporting and corrosion-resistant colloidal magnesium-based heavy oil additive. The preparation steps include: in step (2), the stirring time is 1 h and the standing time is 40 min; in step (3), the drying temperature is 150℃ and the moisture content is ≤0.5%; in step (5), the surface modification temperature is 90℃ and the reaction time is 1 h; in step (6), the mixing temperature is 90℃ and the stirring time is 1 h; in step (7), after cooling to 60℃, the combustion-supporting agent is added, the constant temperature stirring temperature is 60℃, and the stirring time is 1 h.

[0084] This embodiment has the same weight and components as Embodiment 2, the specific preparation steps are the same, but the specific operating parameters are different. The final product is grayish-white with uniform color and no layering.

[0085] Example 7

[0086] This invention provides a method for preparing a combustion-supporting and corrosion-resistant colloidal magnesium-based heavy oil additive. The preparation steps include: in step (2), the stirring time is 0.5 h and the standing time is 10 min; in step (3), the drying temperature is 150℃ and the moisture content is ≤0.5%; in step (5), the surface modification temperature is 80℃ and the reaction time is 1 h; in step (6), the mixing temperature is 80℃ and the stirring time is 1 h; in step (7), after cooling to 50℃, the combustion-supporting agent is added, the constant temperature stirring temperature is 50℃, and the stirring time is 0.5 h.

[0087] This embodiment has the same weight and components as Embodiment 2, the specific preparation steps are the same, but the specific operating parameters are different. The final product is grayish-white with uniform color and no layering.

[0088] Example 8

[0089] This embodiment has the same weight and components as Embodiment 2, the specific preparation steps are the same, but the specific operating parameters are different. The final product is grayish-white with uniform color and no layering.

[0090] This invention provides a method for preparing a combustion-supporting and corrosion-resistant colloidal magnesium-based heavy oil additive. The preparation steps include: in step (2), the stirring time is 0.5 h and the standing time is 10 min; in step (3), the drying temperature is 90℃ and the moisture content is ≤0.5%; in step (5), the surface modification temperature is 90℃ and the reaction time is 0.5 h; in step (6), the mixing temperature is 90℃ and the stirring time is 0.5 h; in step (7), after cooling to 50℃, the combustion-supporting agent is added, the constant temperature stirring temperature is 60℃, and the stirring time is 0.5 h.

[0091] Example 9

[0092] This embodiment has the same weight and components as Embodiment 2, the specific preparation steps are the same, but the specific operating parameters are different. The final product is grayish-white with uniform color and no layering.

[0093] This invention provides a method for preparing a combustion-supporting and corrosion-resistant colloidal magnesium-based heavy oil additive. The preparation steps include: in step (2), the stirring time is 0.75 h and the standing time is 25 min; in step (3), the drying temperature is 120℃ and the moisture content is ≤0.5%; in step (5), the surface modification temperature is 85℃ and the reaction time is 0.75 h; in step (6), the mixing temperature is 85℃ and the stirring time is 0.75 h; in step (7), after cooling to 55℃, the combustion-supporting agent is added, the constant temperature stirring temperature is 55℃, and the stirring time is 0.75 h.

[0094] The above-mentioned combustion-supporting and corrosion-resistant colloidal magnesium-based heavy oil additive is used as follows: It is added to the boiler fuel system using a skid installed outside the boiler. The additive is automatically and quantitatively drawn into the mixing tank, which intermittently agitates to ensure uniform emulsification. A metering pump then injects the additive into the fuel oil through a pre-set pipeline from the outlet to the fuel oil filter before the burner, where it is automatically and uniformly mixed with the fuel oil flow. The additive dosage is controlled to be 0.1-0.3% of the fuel oil entering the boiler.

[0095] Table 1. Emission data of heavy fuel oil after adding Example 1 of the present invention

[0096] ,

[0097] As shown in Table 1, Example 1 demonstrates that the heavy oil burnout rate is increased to 98%. Emissions were reduced by 70%, particulate matter emissions were reduced by 98%, and the blockage problem caused by heavy oil combustion in low-temperature heat exchangers such as air preheaters was basically eliminated. Emissions are reduced by 50%. The heavy oil additive of this invention improves the combustion rate of heavy oil, significantly reducing pollutant emission concentrations and improving the environment while solving the problems of high particulate matter emissions and carbon buildup causing burner blockage during heavy oil combustion. Furthermore, the additive of this invention can inhibit corrosion caused by high-temperature boiler steam and heavy oil rich in vanadium and sodium metals. In the high-temperature range, highly active magnesium oxide, basic copper chloride, and hydrated lime powder form a "Mg–Ca–Cu" multi-element vanadium-capturing system, which can... Transforming it into a high-melting-point composite basic vanadate solves the problem. High-temperature oxidation and corrosion problems.

[0098] like Figure 3 The diagram illustrates the protective effect of the combustion-supporting and corrosion-resistant colloidal magnesium-based heavy oil additive of this invention on metals during use. The experiment aimed to verify the protective effect of the additive against corrosion from acidic flue gas in heavy oil. Methodically, metal samples (fresh metal surfaces) of the boiler heat exchanger tube bundle were divided into two groups: Group 1 (samples 1-5) was exposed to pure acidic flue gas as a control, while Group 2 (samples 6-10) had the combustion-supporting and corrosion-resistant colloidal magnesium-based heavy oil additive added. The development of pitting corrosion in both groups was observed at five time points: 24 h, 48 h, 72 h, 96 h, and 120 h. Results showed that in Group 1, the pitting pits continued to expand and deepen over time, indicating severe direct corrosion from the acidic flue gas. In Group 2, the additive, while improving the acidity of the flue gas, also formed a thin oxide layer on the metal surface, protecting the heated surface and significantly reducing the degree of pitting corrosion. This helps to inhibit the corrosion of the boiler by compounds produced during heavy oil combustion, extending the service life of the equipment. The additive of this invention can improve combustion efficiency and catalyze combustion and smoke elimination. Surface modifiers promote uniform mixing of oil and water, resulting in more uniform atomization of fuel oil upon entering the combustion zone of the furnace, thus improving the combustion efficiency of heavy oil. Nano-silica and basic copper chloride form active centers, which lower the ignition point temperature, increase the flame center temperature, improve the burnout rate, increase the average temperature of the radiant heating surface, improve boiler efficiency and output, and save 2-3% of fuel oil overall.

[0099] Comparative Example 1

[0100] This comparative example uses the same weight composition as Example 2, but with a different proportion of magnesium oxide. The amount of magnesium oxide used is 85 parts, exceeding the range of 50-80 parts defined in the claims of this invention. A combustion-supporting and corrosion-resistant colloidal magnesium-based heavy oil additive comprises, by weight: 85 parts magnesium oxide, 13 parts bentonite, 8 parts lime powder, 13 parts nano-silica, 13 parts gibbsite powder, 8 parts basic copper chloride, 5 parts sodium dodecylbenzenesulfonate, 5 parts kerosene, 5 parts linoleic acid, and 90 parts water.

[0101] The comparative example follows essentially the same operational steps as Example 2, but differs in weight. The resulting product is a grayish-white slurry with an uneven appearance. After being sealed and left to stand at room temperature (25°C) for 24 hours, obvious solid-liquid stratification occurred. An aqueous phase layer of approximately 5 mm precipitated on the upper layer, and a hard precipitate formed at the bottom of the container, which felt noticeably granular when touched with a glass rod. The results indicate that the product lacks storage stability. The results also show that when the amount of magnesium oxide increased to 85 parts, the solid-liquid ratio exceeded a critical range in a system with 90 parts water. This resulted in the limited water being insufficient to fully solubilize and hydrate the surface of the excess magnesium oxide particles, thus failing to form a stable magnesium hydroxide colloidal network. Simultaneously, the excessive solid particles disrupted the gel structure synergistically constructed by nano-silica and clay, causing the yield stress of the system to be insufficient to support the weight of the solid particles, ultimately leading to particle aggregation, sedimentation, and system stratification. This comparative example confirms that the magnesium oxide dosage range (50–80 parts) defined in the claims of this invention is a key technical condition for preparing a stable and uniform colloidal additive.

[0102] Comparative Example 2

[0103] This comparative example uses the same composition by weight as Example 2, but replaces the surfactant sodium dodecylbenzenesulfonate with glycerin. A combustion-supporting and corrosion-preserving colloidal magnesium-based heavy oil additive comprises, by weight: 65 parts magnesium oxide, 13 parts bentonite, 8 parts lime powder, 13 parts nano silica, 13 parts gibbsite powder, 8 parts basic copper chloride, 5 parts glycerin, 5 parts kerosene, 5 parts linoleic acid, and 100 parts water.

[0104] The comparative example follows essentially the same operational steps as Example 2, but differs in weight proportions. After preparation and cessation of mechanical stirring, the mixture rapidly separates within 10 minutes, ultimately forming a clearly defined three-phase system: an upper layer of colorless and transparent hydrocarbon solvent (kerosene), a middle layer of turbid aqueous phase, and a bottom layer of grayish-white solid particle precipitate. The product completely lacks the basic characteristics of an emulsion or suspension. Glycerol, being a polyol, does not possess the amphiphilic molecular structure characteristic of surfactants, and therefore cannot accumulate at the oil / water interface to reduce interfacial tension. The results indicate that hydrocarbon solvents cannot form stable emulsion droplets in the aqueous phase. Simultaneously, glycerol cannot effectively wet and modify the surface of inorganic particles such as magnesium oxide; the particles agglomerate and rapidly settle due to van der Waals forces. This comparative example confirms that the surface modifier described in the claims of this invention is an indispensable functional component for achieving oil-phase emulsification and stable solid-phase suspension, and cannot be replaced by non-surface-active substances.

[0105] Comparative Example 3

[0106] A combustion-supporting and corrosion-resistant colloidal magnesium-based heavy oil additive comprises, by weight: 65 parts magnesium oxide, 13 parts bentonite, 8 parts lime powder, 13 parts quartz sand, 13 parts gibbsite powder, 8 parts basic copper chloride, 5 parts sodium dodecylbenzenesulfonate, 5 parts kerosene, 5 parts linoleic acid, and 100 parts water.

[0107] The comparative example follows essentially the same operational steps as Example 2, but differs in weight. Thirteen parts of nano-silica were replaced with an equal weight of ordinary quartz sand powder, which has the same chemical composition but a completely different physical morphology and particle size. Within one hour of standing, the majority of the quartz sand powder and other solid particles in the resulting mixture rapidly settled to the bottom of the container, forming a dense sediment layer. The upper liquid underwent severe stratification, and the product completely lost its suspension stability. Nano-silica, due to its nano-sized particle size, large specific surface area, and numerous silanol groups on its surface, can form a three-dimensional gel network structure in the aqueous phase through hydrogen bonding, exhibiting excellent thixotropy and suspension capabilities. This network structure can effectively encapsulate and support denser particles such as magnesium oxide and lime powder, resisting gravity settling. Ordinary quartz sand powder, on the other hand, consists of micron-sized particles with an extremely small specific surface area and lacks active groups on its surface. It does not possess the ability to form a gel network and exists only as an inert filler in the system, settling rapidly under gravity. This comparative example demonstrates that the present invention uses nano-silica as a key component, utilizing its unique nanomaterial properties to construct a stable suspension system, which is impossible with ordinary silica materials, highlighting the ingenuity of the technical solution of the present invention.

[0108] Table 2. Stability of each comparative sample product

[0109] ,

[0110] The data comparison in Table 2 shows that in Comparative Example 1, when an inappropriate magnesium oxide:water ratio was selected, reducing the water content in the product to 50 parts resulted in micro-powder agglomeration, coarsening of kerosene droplets, and difficulty in effectively dispersing and stabilizing the interface with linoleic acid. The product appearance was uneven in color, with a noticeable granular texture, and exhibited turbidity and stratification. Insufficient water content led to poor micro-powder dispersion and unstable emulsification.

[0111] In Comparative Example 2, when sodium dodecylbenzenesulfonate was chosen as the surfactant and replaced with glycerol, glycerol had no surface activity and could not reduce the interfacial tension between oil and water. Kerosene could not be dispersed, resulting in the product failing to form a stable emulsion system. The surface of the micropowder was not coated, and the hydrophilic particles precipitated in the water and completely separated from the oil phase. The surface modification failed, and the final product was separated into three phases: oil, water, and solid. Kerosene floated rapidly, while the micropowder precipitated, resulting in uneven color and a noticeable particle texture.

[0112] In Comparative Example 3, when quartz sand powder was chosen to replace nano-silica, the coarse particles lacked thickening and suspending capabilities, could not resist gravity settling, and lacked surface silanol groups, thus failing to synergistically stabilize the emulsion interface with surfactants. After standing, sand particles precipitated at the bottom, the upper clear liquid separated, resulting in severe stratification, uneven product color, obvious particle texture, turbidity, and loss of suspension stability.

[0113] As demonstrated by the above embodiments and comparative examples, this invention can produce a combustion-aiding and corrosion-resistant colloidal magnesium-based heavy oil additive. The resulting product exhibits good stability and is a uniformly colored, grayish-white product without any layering. This additive improves the combustion efficiency of heavy oil, reduces the emission concentration of pollutants, and solves the problems of high particulate matter emissions and carbon buildup during heavy oil combustion that cause burner blockage. It also helps to inhibit the corrosion of boilers by compounds produced during heavy oil combustion, thus extending the service life of the equipment.

[0114] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A combustion-supporting, corrosion-inhibiting, colloidal magnesium-based heavy oil additive, characterized in that, By weight parts comprising: Magnesium oxide 50~80 parts, clay 10~15 parts, lime powder 5~10 parts, nano-silica 10~15 parts, basic copper chloride 5~10 parts, diaspore powder 10~15 parts, surface modifier 2~8 parts, hydrocarbon solvent 2~8 parts, combustion dispersant 2~8 parts, water 80~100 parts, wherein, the nano-silica can form a three-dimensional space gel network structure in the aqueous phase by hydrogen bonding to wrap and support the magnesium oxide, lime powder solid particles, resist gravity settlement, to build a stable colloidal suspension system.

2. A combustion-supporting and corrosion-inhibiting colloidal magnesium-based heavy oil additive according to claim 1, characterized in that, The combustion dispersant is one or several of oleic acid, linoleic acid, methyl oleate, sulfonic acid.

3. A combustion-supporting and corrosion-inhibiting colloidal magnesium-based heavy oil additive according to claim 2, characterized in that, The clay is bentonite.

4. A combustion-supporting, corrosion-inhibiting, colloidal magnesium-based heavy oil additive according to claim 3, characterized in that The hydrocarbon solvent is kerosene, diesel or petroleum distillate with a distillation range of 180~350℃ and an aromatic content of ≤25 wt%.

5. A combustion-supporting, corrosion-inhibiting, colloidal magnesium-based heavy oil additive according to claim 4, characterized in that The surface modifier is sodium dodecyl benzene sulfonate.

6. A process for the preparation of the combustion-supporting, corrosion-inhibiting, colloidal magnesium-based heavy oil additive according to any one of claims 1 to 5, characterized in that The method comprises the following steps: S100: according to the weight ratio of magnesium oxide, bentonite, lime powder, nano-silica, diaspore powder and basic copper chloride components, the components are weighed to obtain the weighed components; S200: add 100 parts of water to the weighed components, stir at room temperature, stand, remove the supernatant, repeat at least twice to obtain the washed solid; S300: heat and dry the washed solid to a water content of less than 0.5%, to obtain the dried material; S400: crush and screen the dried material, collect the micropowder with a particle size of less than 2 μm, and collect 100 parts; S500: add 2~8 parts of sodium dodecyl benzene sulfonate to the collected micropowder, stir uniformly, heat to a certain temperature range, and then react at constant temperature for a period of time to complete the surface modification, to obtain mixture 1; S600: keep the temperature constant, add 2~8 parts of hydrocarbon solvent to mixture 1, continue to stir and mix uniformly to obtain mixture 2; S700: wait for mixture 2 to cool at room temperature, then add 2~8 parts of combustion dispersant and 100 parts of water, stir and mix uniformly at constant temperature to obtain mixture 3; S800: filter mixture 3 through an 8000 mesh screen to obtain the heavy oil additive.

7. The method of claim 6, wherein the method is characterized by, In S200, the stirring time is 0.5~1 h and the standing time is 10~40 min.

8. The method of claim 6, wherein the method is characterized by, In S300, the heating temperature range is 90~150℃.

9. The method of claim 6, wherein the method is characterized by, In S500, the temperature range and the constant temperature reaction temperature range are 80~90℃.

10. The method of claim 9, wherein the method is characterized by: In S500, the constant temperature reaction time is 0.5~1 h.

11. The method of claim 6, wherein the method is characterized by, In S600, the constant temperature temperature range is 80~90℃.

12. The method of claim 11, wherein the method is characterized by: In S600, the stirring time is 0.5~1 h.

13. The method of claim 6, wherein the method is characterized by: In S700, the cooling temperature at room temperature is 50~60℃, and the temperature range for constant temperature stirring after adding the combustion dispersant is 50~60℃.

14. The method of claim 13, wherein the method is characterized by: In S700, the constant temperature stirring time after adding the combustion dispersant is 0.5~1 h.

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