Solid fuel combustion improver for pellet rotary kiln as well as preparation method and use method of solid fuel combustion improver

Abstract

The invention aims to provide a solid combustion improver for a pellet rotary kiln as well as a preparation method and a use method of the solid combustion improver, aiming at the problems of the conventional solid fuel combustion improver. The fuel combustion improver comprises biomass fuel and an organic additive, the mass ratio of the organic additive to the biomass fuel is (5-0.5%): (95-99.5%). The combustion improver disclosed by the invention can greatly reduce emission of smoke dust and harmful gas, delay the ring forming speed of the pellet rotary kiln, reduce the labor intensity of manual cleaning, relieve abrasion of a fuel spray gun, improve the productivity of the pellet rotary kiln, reduce energy waste and prolong the service life of the rotary kiln.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of solid fuel combustion improver and production, in particular to a solid combustion improver for pelletizing rotary kiln and its preparation and use method. BACKGROUND

[0002] Although the existing pelletizing rotary kiln combustion system can use low-cost coal powder or new biomass charcoal fuel, the inherent structural characteristics and composition defects of solid fuel lead to three key problems in operation: first, the incomplete combustion of fuel produces a large amount of flue gas and harmful pollutants, which is due to the high volatile matter in ordinary biomass fuel generating a large amount of carbon-rich free radicals in the pyrolysis process. These free radicals generate ultra-fine carbon soot particles under insufficient oxygen conditions, and the sulfur iron contained in the coal powder decomposes SO2 at high temperature, and forms low-melting-point sulfates with alkali metals in biomass ash, which together constitute adhesive fly ash; second, the kiln body ring formation phenomenon is significantly aggravated, the fundamental reason is that the K2O and Na2O contained in the biomass ash react with aluminum oxide in the kiln lining to generate expansion, plus unburned carbon particles and Fe2O3 on the surface of the pellet to form FeO·SiO2 eutectic, which together reduce the ring formation period; finally, the equipment loss and energy waste are serious, which is manifested as the wear rate of the fuel lance is increased due to particle erosion and high-temperature corrosion, the heat consumption per ton of pellets is increased, the frequency of manual ring cleaning is increased, and the labor intensity of personnel is increased. The introduction of combustion improver will reduce the fuel ignition point, reduce the particulate matter emission concentration, increase the alkali metal melting temperature, significantly delay the ring formation period, reduce the wear rate and prolong the service life of the key components, and simultaneously realize the reduction of ring cleaning period and the improvement of energy utilization rate.

[0003] In the prior art, there are also certain studies on the improvement of rotary kiln fuel, for example: The patent application with application number CN202510657668.1 provides a coal gangue-based solid fuel and its preparation method, which is prepared from n-butanol, octylphenol polyoxyethylene ether, tetrabutyl titanate, calcium nitrate, cerium nitrate, nickel nitrate and other compounds through a certain process. The combustion improver can significantly reduce the fuel ignition point, but the preparation process is complex, and other alkali metals are introduced, which may increase the rate of ring formation. The patent with authorization announcement number CN102409166B provides a sintering combustion improver and its adding method, which has the advantage that the addition of the combustion improver will lower the melting point, but the nitrate in the used raw materials has the disadvantages of insufficient thermal stability and calcium carbonate easily causing ring formation. The patent application with application number CN202310400924.X provides a combustion improver for solid fuel and its preparation method and use, which can achieve full combustion while reducing flue gas pollution emissions and can improve fuel utilization. However, the addition of core component nano-oxide will significantly reduce the active specific surface area at high temperature, and the catalytic efficiency of the loaded particles will decay quickly. At the same time, organic residues produced in the hydrothermal process may generate dioxin and other harmful substances in combustion, and the preparation cost is relatively high, which may limit the promotion in the application scenario of pelletizing rotary kiln due to stability, economy and environmental risk. The patent application with application number CN200810029324.2 provides a biomass solid fuel and processing technology, which uses various agricultural and forestry wastes (rice husk, sawdust, straw, etc.) and a small amount of inorganic binder to prepare solid fuel, which has significantly improved heat density and relatively simple process, and is easy to organize production. However, the energy consumption is high during the carbonization stage in the preparation process, and the tar and acidic water produced in the carbonization process need to be treated, which is more suitable for township-type biomass fuel plants with concentrated raw materials and low investment requirements. The patent application with application number CN200710178416.2 provides an ignition combustion improver and ignition combustion device, which mainly solves the problems of difficult ignition of traditional solid fuel, low initial combustion temperature and unstable combustion. However, the main components of the combustion improver are anhydrous alcohol, industrial alcohol, machine oil and diesel, which cannot cover large-scale continuous combustion scenarios and are only suitable for start-up stage or small-capacity grate furnaces. The patent application with application number CN202211680612.0 provides an organic waste solid formed fuel and its production method, which can obtain a solid fuel with low moisture content, high calorific value and can be directly fed into a grate furnace or a fluidized bed boiler for combustion. The method uses raw materials with wide adaptability and low energy consumption in the production process, but has high requirements for impurity content of raw materials and high risk of enrichment of chlorine and alkali metals. Therefore, if there is no cheap waste heat or long-distance transportation, the economic efficiency and technical reliability will be significantly weakened. In the work of the literature "Research and Application of New Dry Process Cement Coal-saving Combustion Improver", the combustion improver will improve the basic combustion performance, increase the burnout rate and have simple equipment, but still needs to be improved to increase energy-saving capacity and reduce preparation cost.In the literature "Shougang shares blast furnace coal injection combustion improver practice and research", the combustion improver optimizes the blast furnace working condition, reduces the fuel ratio and the ton iron cost, mainly uses the stability of rare earth CeO2 at high temperature, does not pollute the molten iron, and MnO2 can improve the slag fluidity. The shortcomings are embodied in two aspects, on the one hand, the permeability of the furnace is deteriorated-the permeability index is decreased, which leads to the narrowing of the operation window. On the other hand, the price of rare earth CeO2 is expensive, and it depends on the supply chain. The solid powder used needs to be premixed, otherwise it may block the gun.

[0004] Based on the problems of the existing combustion improver scheme, such as complex process, introduction of additional alkali metal, poor thermal stability, high cost or only applicable to the ignition stage, it is urgent to develop a solid fuel combustion improver for rotary kiln working condition and to solve the existing problems. SUMMARY

[0005] The purpose of the present application is to provide a solid combustion improver for pellet rotary kiln and its preparation and use method, which can greatly reduce the emission of smoke and harmful gas, delay the pellet rotary kiln ring forming speed, reduce the labor intensity of manual cleaning, slow down the wear of fuel injection gun, improve the production capacity of pellet rotary kiln, reduce energy waste and prolong the service life of rotary kiln.

[0006] One of the technical solutions of the present application provides a solid fuel combustion improver for pellet rotary kiln, which comprises biomass fuel and organic additive; the mass ratio of the organic additive to the biomass fuel is 5-0.5%:95-99.5 wt%.

[0007] Further, the solid fuel combustion improver, the biomass fuel is at least one of rice husk, peanut shell, cotton shell, corn cob, corn stalk, sorghum stalk, bamboo chips and wood chips; the biomass fuel is a high-fiber-content, alkali metal content moderate ash by-product of agriculture and forestry, which is porous after washing-drying-milling, can fully absorb and fix the organic additive in the subsequent mixing process, and provides a carrier for the low-dose combustion system.

[0008] Further, the solid fuel combustion improver, the organic additive is composed of the following raw materials in mass percentage, the total mass is 100%: 5-20 wt% of a solubilizing agent, 10-40 wt% of an organic ammonium compound, 10-40 wt% of an anionic surfactant and 10-30 wt% of lignin sulfonate.

[0009] Further, the solid fuel combustion improver described above, the cosolvent is at least one of triethanolamine, castor oil and dimethyl ether; the cosolvent can dissolve or solubilize the organic ammonium compound, anionic surfactant and other components as a solvent to form a uniform organic additive solution / emulsion; wherein, triethanolamine and castor oil both contain polyhydroxy or ester bond, which can decompose to generate nitrogen-containing free radicals at high temperature, participate in and promote the combustion free radical chain reaction; and can penetrate the cell wall of biomass and destroy the internal hydrogen bond network at room temperature; dimethyl ether has high volatility and excellent solubility, which can quickly disperse other organic components during grinding; the addition of cosolvent can significantly improve the apparent porosity of biomass fuel, release small molecule free radicals and supplement latent heat at 200-300 ℃ stage, thereby lowering the ignition temperature of the fuel by 20-40 ℃.

[0010] Further, the solid fuel combustion improver described above, the organic ammonium compound is at least one of choline chloride, choline acetate and tetramethylammonium chloride; the organic ammonium compound mainly functions to lower the ignition point while promoting combustion, and catalyze the oxidation of intermediate products to reduce incomplete combustion; this component decomposes to release NH3, amine radical during temperature rise, which can undergo acid-base neutralization reaction with SO2 separated out at high temperature to generate (NH4)2SO4 fine particles, thereby reducing the amount of SO2 entering the flue gas; at the same time, the organic ammonium cation can form high-melting-point organic ammonium salt with K⁺ and Na⁺ in ash, significantly increasing the ash softening temperature and inhibiting the formation of alkali metal low-melting salt, thereby delaying ring formation; decomposes to generate methyl radical or ethyl radical at high temperature; these radicals can effectively initiate and accelerate the oxidation reaction of carbon chain, break the structure of fuel macromolecules, and reduce the activation energy required for initial combustion.

[0011] Further, the solid fuel combustion improver described above, the anionic surfactant is at least one of sodium dodecylbenzenesulfonate, ammonium oleate, sodium oleate, ammonium stearate and sodium stearate; the main function of the anionic surfactant is to improve fuel dispersibility and increase the degree of pulverization when injected, which can significantly reduce the surface tension between fuel particles and air interface, making the fuel more easily broken, dispersed into smaller particles, increasing the contact area with oxygen, and improving the oxygen diffusion efficiency of the fuel particle surface when injected into the kiln.

[0012] Further, the solid fuel combustion improver, the lignin sulfonate is at least one of sodium lignin sulfonate and ammonium lignin sulfonate; the lignin sulfonate as a dispersant and stabilizer can effectively disperse and stabilize biomass fuel particles and organic ammonium compounds and anionic surfactants in the combustion improver, prevent agglomeration, and ensure the effect of uniform mixing; the sodium lignin sulfonate is a high-molecular dispersant salt and can also serve as a carbon source skeleton, generates a porous carbon film at medium temperature, has a certain chelation or adsorption fixation capacity for alkali metal ions, and can also form a low-friction coating on the surface of the kiln lining, reduces high-temperature particle erosion and slag adhesion, and prolongs the service life of the lance and the kiln lining.

[0013] The application further provides a preparation method of the solid fuel combustion improver for the pelletizing rotary kiln. S1, proportionally weighing 5-20 wt% of a cosolvent, 10-35 wt% of an organic ammonium compound, 10-40 wt% of an anionic surfactant, and 10-20 wt% of a lignin sulfonate; S2, uniformly mixing the cosolvent and the organic ammonium compound; S3, adding the anionic surfactant again and uniformly mixing; S4, finally adding the lignin sulfonate, stirring until all the ingredients are completely mixed and uniformly, to obtain an organic additive; S5, cleaning the biomass fuel to remove impurities, and then performing drying treatment to remove excess moisture; S6, according to the mass percentage, pre-mixing the organic additive with the dried biomass fuel, and fully grinding the pre-mixed biomass fuel and the organic additive until nano-sized particles are obtained, to obtain the solid fuel combustion improver for the pelletizing rotary kiln.

[0014] The application further provides a use method of the solid fuel combustion improver for the pelletizing rotary kiln. The solid fuel is a commonly used solid fuel, for example, anthracite, lignite, etc.

[0015] Compared with the prior art, the application has the following advantages: 1, the solid fuel combustion improver for the pelletizing rotary kiln is water-insoluble, non-toxic, non-corrosive, non-polluting, and stable in nature; 2、The anionic surfactant in the organic additive of the solid fuel combustion improver for the pelletizing rotary kiln can reduce surface tension, and can make the combustion improver grinding more sufficient; through the synergistic catalysis mechanism of the organic ammonium compound and the cosolvent, the fuel ignition temperature is significantly reduced and the free radical chain reaction is accelerated, so that the solid fuel realizes full combustion in the rotary kiln, the emissions of unburned carbon particles, SO2 and other pollutants are greatly reduced, the heat consumption per ton of pellets is reduced, and the generation of smoke and energy waste is reduced from the source.

[0016] 3、The solid fuel combustion improver for the pelletizing rotary kiln is mixed with the solid fuel originally used in the rotary kiln, and is used in an amount of 5%-20% by mass, so that the K+ and Na+ in the biomass ash are effectively fixed through the alkali metal chelating ability of the lignin sulfonate and the high melting point salt conversion of the organic ammonium, the reaction of the K+ and Na+ with the kiln lining to form low-melting eutectics is inhibited, the fuel pulverization degree is reduced through the anionic surfactant, the unburned carbon deposition is reduced, the three effects are synergistic, the ring forming period is prolonged, and the manual ring cleaning frequency and labor intensity are significantly reduced.

[0017] 4、The anionic surfactant is used to improve the fuel dispersibility and the low-friction carbon film formed by the lignin sulfonate on the surface of the kiln lining, the fuel lance particle erosion and wear are simultaneously relieved, the corrosion of the kiln body caused by the slag adhesion is reduced, the service life of the key equipment is improved, and the production capacity of the rotary kiln is improved and long-term stable operation is realized. DETAILED DESCRIPTION

[0018] The technical solutions of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0019] A solid fuel combustion improver for a pelletizing rotary kiln, comprising a biomass fuel and an organic additive; the mass ratio of the addition amount of the organic additive to the biomass fuel is 5-0.5%:95-99.5 wt%; The organic additive is composed of the following raw materials in mass percentage: 5-20 wt% of a cosolvent, 10-40 wt% of an organic ammonium compound, 10-40 wt% of an anionic surfactant and 10-30 wt% of lignin sulfonate.

[0020] Among them, the biomass fuel is at least one of rice husk, peanut shell, cotton hull, corn cob, corn stalk, sorghum stalk, bamboo chips and sawdust;

[0021] The cosolvent is at least one of triethanolamine, castor oil and dimethyl ether;

[0022] The organic ammonium compound is at least one of choline chloride, choline acetate, and tetramethylammonium chloride.

[0023] The anionic surfactant is at least one of sodium dodecylbenzenesulfonate, ammonium oleate, sodium oleate, ammonium stearate, and sodium stearate.

[0024] The lignosulfonate is at least one of sodium lignosulfonate and ammonium lignosulfonate.

[0025] The preparation method of the solid fuel combustion improver for a pelletizing kiln described above comprises the following steps: S1. A proportion of 5-20 wt% of a cosolvent, 10-35 wt% of an organic ammonium compound, 10-40 wt% of an anionic surfactant, and 10-20 wt% of a lignosulfonate is weighed; S2. The cosolvent and the organic ammonium compound are mixed uniformly; S3. The anionic surfactant is added again, and mixed uniformly; S4. The lignosulfonate is finally added, and stirred until all the ingredients are mixed uniformly to obtain a mixed organic additive; S5. The biomass fuel is cleaned to remove impurities, and then dried to remove excess moisture; S6. According to the mass percentage, the mixed organic additive is premixed with the dried biomass fuel, and the premixed biomass fuel and the organic additive are put into a ball mill for sufficient grinding until reaching a nano-level particle, i.e. a solid fuel combustion improver for a pelletizing kiln is obtained.

[0026] The use method of the solid fuel combustion improver for a pelletizing kiln described above is to mix the combustion improver with a solid fuel for a pelletizing kiln, and the addition amount is 5-20% of the mass of the solid fuel.

[0027] Example 1 The biomass charcoal combustion improver for a pelletizing kiln comprises an organic additive with an addition amount of 2 wt% of the total mass of the solid fuel combustion improver and a biomass fuel with an addition amount of 98 wt% of the total mass of the solid fuel combustion improver; Specifically, the organic additive comprises 12 wt% of a cosolvent, 36 wt% of an anionic surfactant, 30% of an organic ammonium compound, and 22 wt% of a lignosulfonate; Specifically, the biomass fuel is rice husk and peanut shell with a mass ratio of 1:1; Specifically, the cosolvent is triethanolamine; Specifically, the anionic surfactant is sodium dodecylbenzenesulfonate; Specifically, the organic ammonium compound is choline chloride; Specifically, the lignin sulfonate is sodium lignin sulfonate.

[0028] The preparation method of the solid fuel combustion improver for pelletizing rotary kiln comprises the following steps: S1, uniformly mixing a complexing agent and an organic ammonium compound; S2, further adding an anionic surfactant and uniformly mixing; S3, finally adding sodium lignin sulfonate and stirring until all ingredients are uniformly mixed to obtain a mixed organic additive; S4, cleaning biomass fuel to remove impurities and then drying to remove excess moisture; S5, premixing the mixed organic additive and the dried biomass fuel according to the mass percentage, and putting the premixed biomass fuel and organic additive into a ball mill for sufficient grinding until reaching a nano-level particle, and finally obtaining a solid fuel combustion improver for pelletizing rotary kiln.

[0029] The use method of the solid fuel combustion improver for pelletizing rotary kiln is that the combustion improver is mixed with the solid fuel for pelletizing rotary kiln, and the addition amount is 10% of the mass of the solid fuel.

[0030] Comparative Example 1 The combustion improver comprises an organic additive with an addition amount of 2 wt% of the total mass of the solid fuel combustion improver and biomass fuel with an addition amount of 98 wt% of the total mass of the solid fuel combustion improver; Specifically, the organic additive comprises, by mass percentage, 20 wt% of a complexing agent, 40 wt% of an anionic surfactant, and 40 wt% of a lignin sulfonate; Specifically, the biomass fuel is rice husk and peanut shell with a mass ratio of 1:1; Specifically, the complexing agent is triethanolamine; Specifically, the anionic surfactant is sodium dodecyl benzene sulfonate; Specifically, the lignin sulfonate is sodium lignin sulfonate.

[0031] The preparation method of the combustion improver comprises the following steps: S1, uniformly mixing a complexing agent and an anionic surfactant; S2, further adding sodium lignin sulfonate and stirring until all ingredients are uniformly mixed to obtain a mixed organic additive; S3, cleaning biomass fuel to remove impurities and then drying to remove excess moisture; S4. According to the mass percentage example, premix the mixed organic additive with the dried biomass fuel, put the premixed biomass fuel and organic additive into a ball mill, and grind them thoroughly until they reach nano-sized particles, and finally obtain the combustion aid.

[0032] The method of using the combustion improver is the same as in Example 1.

[0033] Example 2 Biochar combustion aid for rotary kilns of pellet ore includes an organic additive with an addition amount of 4 wt% of the total mass of solid fuel combustion aid and a biomass fuel with an addition amount of 96 wt% of the total mass of solid fuel combustion aid; Specifically, the organic additives are composed of the following components by mass percentage: 14 wt% cosolvent, 29 wt% organic ammonium compound, 30 wt% anionic surfactant, and 27% lignin sulfate. Specifically, the biomass fuel is rice husks and peanut shells in a mass ratio of 1:1; Specifically, the co-solvent is triethanolamine and castor oil in a mass ratio of 1:1; Specifically, the organic ammonium compound is choline acetate; Specifically, the anionic surfactant is sodium dodecylbenzenesulfonate and sodium stearate in a mass ratio of 7:3; Specifically, the lignin sulfate is ammonium lignin sulfate.

[0034] The preparation method of solid fuel combustion aid for rotary kilns of pellet ore includes the following steps: S1. Mix the cosolvent and the organic ammonium compound evenly; S2. Add an anionic surfactant and mix well. S3. Finally, add sodium lignosulfonate and stir until all ingredients are completely mixed to obtain a mixed organic additive. S4. Clean the biomass fuel to remove impurities, and then dry it to remove excess moisture. S5. According to the mass percentage example, the mixed organic additives are premixed with the dried biomass fuel. The premixed biomass fuel and organic additives are put into a ball mill and ground thoroughly until nano-sized particles are reached, finally obtaining a solid fuel combustion aid for rotary kilns of pellets.

[0035] Method of using solid fuel combustion improver for rotary kilns of pellet ore: Mix the combustion improver with solid fuel for rotary kilns of pellet ore, and add 15% of the mass of solid fuel.

[0036] Comparative Example 2 Combustion improvers, including organic additives added at a rate of 4 wt% of the total mass of solid fuel combustion improvers and biomass fuels added at a rate of 96 wt% of the total mass of solid fuel combustion improvers; Specifically, the organic additive comprises, by weight percentage: 20 wt% cosolvent, 40 wt% organic ammonium compound, and 40 wt% anionic surfactant. Specifically, the biomass fuel is rice husks and peanut shells in a mass ratio of 1:1; Specifically, the co-solvent is triethanolamine and castor oil in a mass ratio of 1:1; Specifically, the organic ammonium compound is choline acetate.

[0037] Specifically, the anionic surfactant is sodium dodecylbenzenesulfonate and sodium stearate in a mass ratio of 7:3.

[0038] The preparation method of the combustion improver includes the following steps: S1. Mix the cosolvent and the organic ammonium compound evenly; S2. Add an anionic surfactant and mix well. S3. Clean the biomass fuel to remove impurities, and then dry it to remove excess moisture. S4. According to the mass percentage example, premix the mixed organic additive with the dried biomass fuel, put the premixed biomass fuel and organic additive into a ball mill, and grind them thoroughly until they reach nano-sized particles, and finally obtain the combustion aid.

[0039] The method of using the combustion improver is the same as in Example 2.

[0040] The comparison of the effects of adding combustion improvers before and after the above embodiments and comparative examples is shown in the table.

[0041] Table 1. Effects of Combustion Improvers Performance indicators Blank group Comparative example 1 Comparative example 2 Example 1 Example 2 Particulate matter (mg / Nm3) 305 275 290 142 175 SO2emissions (ppm) 440 590 425 295 320 Maximum build-up thickness (mm) 34.2±1.5 29.8±1.2 37.6±1.8 11.5±0.6 9.8±0.5 Cleaning cycle (days) 7 8 6 33 38 Spray gun wear (mm) 1.15 0.98 1.28 0.38 0.29 Comparative data from the comparative examples and embodiments demonstrate that the synergistic effect of the four components in the combustion aid of this invention is an inseparable core technology. When the organic ammonium compound is missing (Comparative Example 1), the reduction in SO2 concentration in the flue gas is relatively small due to the loss of free radical catalytic chain reaction and the chemical fixation ability of amine groups on SO2. Simultaneously, the inability to convert alkali metals into high-melting-point salts reduces the ring-forming inhibition effect, fully demonstrating the irreplaceable role of organic ammonium compounds in deep emission reduction and ring-forming delay. When sodium lignosulfonate is missing (Comparative Example 2), the lack of its alkali metal chelating function and the protection of the kiln lining carbon film leads to intensified ring formation and increased spray gun wear, highlighting the crucial role of this component in extending equipment lifespan. This invention achieves combustion catalysis and in-situ pollutant conversion through organic ammonium compounds, while sodium lignosulfonate simultaneously performs alkali metal passivation and physical protection. Combined with the pulverizing effect of anionic surfactants and the low-temperature free radical release of the co-solvent, this significantly reduces particulate matter / SO2 emissions, extends the ring-forming cycle, and improves equipment lifespan.

[0042] In the description of this specification, the references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A solid fuel combustion aid for rotary kilns used in pelletizing operations, characterized in that, It includes biomass fuel and organic additives; the mass ratio of the organic additives to the biomass fuel is 5-0.5%: 95-99.5 wt%. The organic additive is composed of the following raw materials in the following mass percentages: 5-20 wt% of cosolvent, 10-40 wt% of organic ammonium compound, 10-40 wt% of anionic surfactant and 10-30 wt% of lignin sulfonate.

2. The solid fuel combustion aid for rotary kilns of pellet ore according to claim 1, characterized in that, The biomass fuel is at least one of rice husks, peanut shells, cotton husks, corn cobs, corn stalks, sorghum stalks, bamboo chips, and wood chips.

3. The solid fuel combustion aid for rotary kilns of pellet ore according to claim 1, characterized in that, The co-solvent is at least one of triethanolamine, castor oil, and dimethyl ether.

4. The solid fuel combustion aid for rotary kilns of pellet ore according to claim 1, characterized in that, The organic ammonium compound is at least one of choline chloride, choline acetate, and tetramethylammonium chloride.

5. The solid fuel combustion aid for rotary kilns of pellet ore according to claim 1, characterized in that, The anionic surfactant is at least one of sodium dodecylbenzenesulfonate, ammonium oleate, sodium oleate, ammonium stearate, and sodium stearate.

6. The solid fuel combustion aid for rotary kilns of pellet ore according to claim 1, characterized in that, The lignin sulfonate is at least one of sodium lignin sulfonate and ammonium lignin sulfonate.

7. The method for preparing the solid fuel combustion aid for rotary kilns of pellet ore according to any one of claims 1 to 6, characterized in that, Includes the following steps: S1. Weigh out 5-20 wt% of cosolvent, 10-35 wt% of organic ammonium compound, 10-40 wt% of anionic surfactant and 10-20 wt% of lignin sulfonate according to the proportions. S2. Mix the cosolvent and the organic ammonium compound thoroughly; S3. Add an anionic surfactant and mix well. S4. Finally, add lignin sulfonate and stir until all ingredients are completely mixed to obtain the organic additive. S5. Clean the biomass fuel to remove impurities, and then dry it to remove excess moisture. S6. According to the mass percentage example, the organic additive is premixed with the dried biomass fuel, and the premixed biomass fuel and organic additive are thoroughly ground until nano-sized particles are obtained, thus obtaining the solid fuel combustion aid for rotary kilns of pellets.

8. The method of using the solid fuel combustion aid for pellet rotary kilns according to any one of claims 1 to 6, characterized in that, The combustion aid is mixed with solid fuel for rotary kilns of ore pellets, and the amount added is 5-20% of the mass of the solid fuel.