Preparation method of high-calorific-value carbon-free fuel based on high-temperature triggered silicate molecular bond recombination to initiate solid-phase chain reaction continuous heat release

Abstract

The invention discloses a preparation method of a high-calorific-value carbon-free fuel based on high-temperature triggered silicate molecular bond recombination to initiate solid-phase chain reaction continuous heat release, the high-calorific-value carbon-free fuel comprises the following raw materials: red mud, desulfurized gypsum, iron ore tailings, silicate solid waste and calcium carbonate solid waste, and the particle size of each raw material after pretreatment is less than or equal to 200 meshes; the fuel is triggered at a high temperature of more than or equal to 700 DEG C, a multi-level cross solid-phase chain reaction is initiated through silicate molecular bond recombination, the calorific value of the fuel is more than or equal to 15000 kcal / kg, and the reaction peak temperature reaches 2000-3000 DEG C. The invention relates to the technical field of solid waste resource utilization, industrial solid wastes are used as main raw materials, the cost is low, and solid waste resource utilization is realized; no carbon element participates in the reaction process, so that zero CO emission is realized; the biomass fuel has high calorific value and high reaction temperature, and can replace fossil fuel to be used in high-temperature links of industries such as metallurgy, building materials, chemical engineering and thermoelectricity; after the reaction is triggered, the self-maintaining chain type characteristic is achieved, and external energy input is not needed; the fuel is simple in preparation process and easy for large-scale production and application.

Description

Technical Field

[0001] This invention relates to the field of new energy materials and solid waste resource utilization technology, specifically a method for preparing high-calorific-value carbon-free fuel based on a solid-phase chain reaction that is continuously exothermic due to high-temperature-triggered silicate molecular bond recombination. Background Technology

[0002] Traditional fossil fuels suffer from high carbon emissions and are non-renewable, while existing biomass fuels and clean energy sources have limitations in high-temperature industrial heating, such as insufficient calorific value and high cost. Industrial solid wastes, such as red mud, desulfurization gypsum, and tailings, accumulate in large quantities and are difficult to treat. Current utilization methods are mostly limited to low-value-added building materials, failing to fully tap their energy potential.

[0003] Currently, there are no reports of fuel systems that utilize various inorganic silicate solid wastes to undergo solid-phase chain reactions triggered by high temperatures, continuously releasing high-temperature heat energy. Therefore, developing a new type of fuel that combines high calorific value, zero carbon emissions, and the ability to recycle solid waste is of significant industrial and environmental importance. Summary of the Invention

[0004] The present invention aims to provide a fuel system that uses inorganic solid waste as the main raw material and releases high heat energy through a multi-level cross-chain solid-phase reaction triggered by high temperature, thereby achieving the dual goals of high-value utilization of solid waste and high-temperature clean heating.

[0005] The technical solution of the present invention to achieve the above objectives is as follows: In a first aspect, embodiments of the present invention provide a high-calorific-value carbon-free fuel based on a solid-phase chain reaction of continuous exothermic reaction triggered by high-temperature silicate molecular bond recombination. The fuel is a carbon-free inorganic solid waste composite system. Its core raw materials consist of red mud, desulfurized gypsum, iron ore tailings, silicate solid waste, and calcium carbonate solid waste. After pretreatment, the particle size of each raw material is ≤200 mesh, ensuring sufficient contact between the components to guarantee reaction triggering. The fuel is triggered at a high temperature of ≥700℃, through the breaking and recombination of silicate molecular bonds in the silicate solid waste, initiating a multi-level cross-linked solid-phase chain reaction, achieving continuous exothermic reaction. The fuel has a calorific value ≥15000 kcal / kg, and the peak reaction temperature can reach 2000℃–3000℃, meeting the heat requirements of high-temperature processes.

[0006] The raw materials work synergistically: Red mud provides components such as Al2O3 and Fe2O3, which participate in the recombination of silicate molecular bonds and the formation of complex minerals, thus enhancing the sustainability of the chain reaction; the components in the fuel undergo ion diffusion and solid-phase recombination at high temperatures, breaking the original Si-O, Al-O and other bonds, and reforming more stable Si-O-Al, Ca-O-Si and other network structures. The energy released by the formation of new bonds is significantly higher than the energy absorbed by the breaking of old bonds, and the net enthalpy change ΔH < 0, thereby achieving continuous high-temperature exothermic reaction under conditions without the participation of the liquid phase.

[0007] Optionally, the raw materials are mixed in the following percentages: red mud 20%~40%, desulfurized gypsum 10%~25%, iron ore tailings 15%~30%, silicate solid waste 10%~25%, and calcium carbonate solid waste 5%~15%.

[0008] Secondly, embodiments of the present invention provide a method for preparing the above-mentioned high-calorific-value carbon-free fuel. Based on the above-mentioned fuel components, the preparation method includes the following steps: 1. Raw Material Pretreatment: Red mud, desulfurized gypsum, iron ore tailings, silicate solid waste, and calcium carbonate solid waste are dried and crushed respectively. The drying process removes free moisture from the raw materials to avoid problems such as agglomeration and abnormal porosity during subsequent mixing and reaction, ensuring material uniformity. After crushing, the raw materials are further processed by grinding equipment to ensure that the particle size of all raw materials reaches ≤200 mesh, while removing large impurities mixed in with the raw materials, ensuring that the particles of each component are in full contact, providing a foundation for the smooth initiation of silicate molecular bond recombination and solid-phase chain reaction.

[0009] 2. Mixing and Proportioning: Weigh each raw material component after grinding according to the above mass percentage ratio, put them into the mixing equipment for thorough mixing and homogenization. During the mixing process, it is necessary to ensure that each component is evenly distributed, without obvious stratification or local concentration deviation, to avoid the interruption of the chain reaction or exothermic instability due to uneven component distribution. The degree of mixing and homogenization is based on the consistency of material color and the fact that the deviation of sampled components meets the requirements.

[0010] 3. Molding or Powder Preparation: The mixed and homogenized material is processed according to the actual application scenario requirements. It can be granulated and shaped into spherical or cylindrical shapes through pressing, rolling, or other methods to improve the mechanical strength and bulk density of the fuel, making it easier to store, transport, and distribute evenly in the kiln. Alternatively, it can be used directly as powder fuel, suitable for jet feeding scenarios, without the need for additional molding processes, ultimately resulting in a high-calorific-value carbon-free fuel.

[0011] Thirdly, embodiments of the present invention provide an application method for the aforementioned high-calorific-value carbon-free fuel. Specifically, the application method involves applying the fuel to industrial high-temperature kilns, industrial heating systems, or solid waste co-processing systems as a core heat source to provide heat for the production process. During application, an external heat source (such as gas ignition, electric heating, or industrial waste heat) raises the fuel temperature to above 700°C, triggering silicate molecular bond recombination and solid-phase chain reactions. After the reaction begins, the high temperature is maintained by continuous heat release from the fuel's own solid-phase chain reaction, without the need for external catalysts or auxiliary fuels.

[0012] Optionally, the fuel is suitable for processes requiring temperatures above 2000℃ in industries such as metallurgy, building materials, ceramics, and coal-fired power generation. Specifically, it includes scenarios such as metallurgical smelting, high-temperature calcination of building materials, ceramic firing, and heating in high-temperature power generation boilers. It can directly or partially replace traditional hydrocarbon fuels, reducing carbon emissions and fuel costs.

[0013] The beneficial effects of this invention are: 1. Utilizing industrial solid waste as the main raw material, the cost is low and solid waste is recycled: The fuel of this invention uses red mud, desulfurized gypsum, iron ore tailings, silicate solid waste, and calcium carbonate solid waste as raw materials. The above raw materials are all large quantities of difficult-to-dispose inorganic solid waste generated in the process of industrial production. They are widely available and have extremely low acquisition costs. Compared with traditional fossil fuels and artificially synthesized non-carbon fuels, the cost of raw materials is greatly reduced. At the same time, through precise matching, this type of solid waste, which was originally mainly landfilled and stockpiled, is transformed into high-calorific-value carbon-free fuel, realizing the high-value resource utilization of solid waste. This not only solves the environmental pollution problem caused by solid waste accumulation, but also taps into the energy value of solid waste, achieving the synergistic benefits of "treating waste with waste and turning waste into treasure".

[0014] 2. The reaction process is carbon-free, achieving zero CO2 emissions: The fuel is a completely inorganic and carbon-free system. Neither the raw materials nor the reaction process involve hydrocarbon components. The energy release mechanism is a multi-level cross-linked solid-phase chain reaction triggered by the recombination of silicate molecular bonds at high temperature. No carbon elements participate in any reaction link, completely eliminating the generation and emission of carbon dioxide from the source. Compared with the traditional fossil fuel combustion energy release mode, it avoids the environmental pressure brought by carbon emissions.

[0015] 3. High calorific value and high reaction temperature, which can replace fossil fuels in high-temperature processes in industries such as metallurgy, building materials, chemicals, and thermal power: The fuel of this invention has a calorific value of ≥15000 kcal / kg and a peak reaction temperature of 2000℃–3000℃, breaking through the calorific value and temperature bottleneck of existing non-carbon fuels. It can meet the high-temperature heat requirements of industries such as metallurgical smelting, high-temperature calcination of building materials, chemical synthesis, and high-temperature boilers in thermal power. It can directly replace or partially replace fossil fuels such as coal and heavy oil, which not only solves the dependence of traditional high-temperature processes on fossil energy, but also avoids carbon emissions and pollutant emissions caused by fossil fuel combustion, and is suitable for the application needs of high-temperature processes in multiple industries.

[0016] 4. The reaction exhibits a self-sustaining chain characteristic after triggering, requiring no external energy input: After being triggered by an external heat source at ≥700℃, the fuel initiates a solid-phase chain reaction through the recombination of silicate molecular bonds. Each stage of the reaction is triggered sequentially and interconnected, and the released heat can sustain subsequent reactions, forming a stable, self-sustaining energy release system. No additional external energy input is required after the reaction starts, and no catalysts or auxiliary fuels are needed throughout the process, simplifying the application process, reducing operating costs, and ensuring the continuity and stability of heat output, making it suitable for continuous industrial production scenarios.

[0017] 5. The fuel preparation process is simple and easy to scale up and apply: The preparation of the fuel of this invention only includes conventional processes such as raw material pretreatment, proportioning, mixing and homogenization, molding or powdering for later use. There are no complicated synthesis or purification steps. The process flow is simple and easy to understand. The preparation process can be completed using existing solid waste treatment, building material production and other equipment. There is no need to add new special and complicated equipment, and the investment cost is low. At the same time, the product can be flexibly made into molded bodies or used directly in powder form according to the application scenario. It is compatible with the feeding requirements of different equipment such as industrial high temperature kilns, heating systems, solid waste co-processing systems, etc., and is easy to achieve large-scale production and industrial promotion. Detailed Implementation

[0018] The present invention will be further described below with reference to the embodiments. Example

[0019] This embodiment prepares a high-calorific-value carbon-free fuel based on a solid-phase chain reaction triggered by high-temperature silicate molecular bond recombination, which is continuously exothermic. The details are as follows: The raw materials are selected by mass percentage as follows: 35% red mud, 20% desulfurized gypsum, 25% iron ore tailings, 15% slag (a silicate solid waste), and 5% carbide slag (a calcium carbonate solid waste). All raw materials are inorganic solid wastes generated during industrial production. Through synergistic formulation, a carbon-free energy-releasing system is constructed to meet the component requirements of solid-phase chain reactions.

[0020] Preparation method: The above raw materials are dried and crushed to remove free moisture and large impurities, and then further ground to below 200 mesh to ensure that the particles of each component are in full contact, which provides a guarantee for the smooth triggering of silicate molecular bond recombination and solid-phase chain reaction at high temperature; the ground raw materials are weighed according to the above proportions and put into a mixing device to be fully mixed and homogenized so that the components are evenly distributed without stratification, and a homogeneous mixture is obtained.

[0021] Application Testing: The prepared mixture was placed in a high-temperature environment of ≥700℃ to trigger the reaction. After ignition by an external heat source, the fuel rapidly initiates a solid-phase chain reaction through the recombination of silicate molecular bonds, entering a self-sustaining energy release state without the need for additional external energy input or catalyst addition. The measured calorific value of this fuel is 15800 kcal / kg, and the peak reaction temperature reaches 2100℃, which can meet the heat requirements of high-temperature processes in industries such as metallurgy and building materials. Moreover, the reaction process produces no carbon dioxide or flue gas emissions, demonstrating zero-carbon and environmentally friendly characteristics. Example

[0022] This embodiment uses different types of silicate solid waste and calcium carbonate solid waste to prepare high-calorific-value carbon-free fuel, as detailed below: The raw materials are selected by mass percentage: 30% red mud, 15% desulfurized gypsum, 30% iron ore tailings, 20% fly ash (for silicate solid waste), and 5% marble powder (for calcium carbonate solid waste). All raw materials are bulk industrial inorganic solid wastes, which are suitable for the needs of solid waste resource utilization.

[0023] The preparation method is the same as in Example 1: each raw material is dried, crushed and ground to ensure that the particle size of all raw materials is below 200 mesh. Then, they are accurately weighed according to the ratio and fully mixed and homogenized to obtain a homogeneous fuel mixture. No additional molding process is required, and it can be directly used for reaction testing.

[0024] Application Testing: Placing the mixture in a 750℃ high-temperature environment to trigger the reaction, the high temperature rapidly activates the recombination of silicate molecular bonds, and the solid-phase chain reaction unfolds quickly, with each stage of the reaction linked together and continuously releasing energy. The measured calorific value of this fuel is 15200 kcal / kg, the entire chain reaction lasts for about 40 minutes, and the heat output is stable. The entire reaction is based on the solid-phase combination of inorganic components, with no carbon elements involved and no flue gas emissions, achieving zero-carbon clean energy release, making it suitable for industrial continuous heating scenarios.

[0025] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A high-calorific-value carbon-free fuel based on a solid-phase chain reaction triggered by high-temperature silicate molecular bond recombination, characterized in that... The raw materials include: red mud, desulfurized gypsum, iron ore tailings, silicate solid waste and calcium carbonate solid waste. After pretreatment, the particle size of each raw material is ≤200 mesh. The fuel is triggered by a multi-level cross solid-phase chain reaction through the recombination of silicate molecular bonds under a high temperature of ≥700℃. The calorific value of the fuel is ≥15000kcal / kg and the peak reaction temperature reaches 2000℃–3000℃.

2. The high-calorific-value carbon-free fuel based on a solid-phase chain reaction triggered by high-temperature silicate molecular bond recombination and continuous exothermic reaction as described in claim 1, characterized in that, The raw materials are proportioned by mass percentage as follows: red mud 20%~40%, desulfurized gypsum 10%~25%, iron ore tailings 15%~30%, silicate solid waste 10%~25%, and calcium carbonate solid waste 5%~15%.

3. A method for preparing a high-calorific-value carbon-free fuel based on a solid-phase chain reaction initiated by high-temperature-triggered silicate molecular bond recombination, wherein the high-calorific-value carbon-free fuel based on a solid-phase chain reaction initiated by high-temperature-triggered silicate molecular bond recombination as described in any one of claims 1-2 is characterized in that, Includes the following steps: a. Raw material pretreatment: Red mud, desulfurized gypsum, iron ore tailings, silicate solid waste and calcium carbonate solid waste are dried and crushed respectively. Drying removes free moisture from the raw materials, and then grinding them to a particle size ≤200 mesh to remove large impurities. b. Proportional mixing: Weigh each raw material component after grinding according to the proportion, put it into the mixing equipment and mix and homogenize it thoroughly to ensure that each component is evenly distributed and to ensure smooth triggering of silicate molecular bond recombination and solid-phase chain reaction. c. Molding or Powdering for Use: The mixed and homogenized materials are granulated to obtain a shaped body of a predetermined form; or directly used as powdered fuel to obtain a finished high-calorific-value carbon-free fuel.

4. A method for applying a high-calorific-value carbon-free fuel based on a solid-phase chain reaction triggered by high-temperature silicate molecular bond recombination and continuously exothermic, wherein the high-calorific-value carbon-free fuel based on a solid-phase chain reaction triggered by high-temperature silicate molecular bond recombination and continuously exothermic, as described in any one of claims 1-2, is characterized in that... The fuel is used as a heat source in industrial high-temperature kilns, industrial heating systems, or solid waste co-processing systems. The fuel temperature is raised to above 700°C by an external heat source to trigger the reaction. After the reaction starts, the temperature is maintained by the continuous release of heat from its own solid-phase chain reaction. No external catalyst or auxiliary fuel is required throughout the process.

5. The method for applying high-calorific-value carbon-free fuels based on high-temperature triggered silicate molecular bond recombination initiating a solid-phase chain reaction with continuous exothermic reaction, as described in claim 4, is characterized in that... The fuel is suitable for processes requiring temperatures above 2000℃ in industries such as metallurgy, building materials, ceramics, and coal-fired power generation.