A sulfur and chlorine fixation agent for refuse-derived fuel, application thereof and refuse-derived fuel

Abstract

This invention discloses a sulfur and chlorine fixation agent for waste-derived fuel, its application, and the waste-derived fuel itself. The raw materials for the sulfur and chlorine fixation agent include the following components by weight: 50-80 parts calcium-based desulfurization ash; 5-30 parts sodium-based desulfurization ash; 5-30 parts quicklime; and 3-15 parts oxidant. This invention also provides the application of the sulfur and chlorine fixation agent for waste-derived fuel in waste-derived fuel and the waste-derived fuel itself. The sulfur and chlorine fixation agent of this invention can significantly reduce the volatilization rate of S and Cl during the combustion of waste-derived fuel, making it suitable for the subsequent utilization of waste-derived fuel in incinerators and gasifiers. It can co-process calcium-based and sodium-based desulfurization ash from steel plants, achieving the effects of waste-to-waste treatment, low investment, and rapid results.

Description

Technical Field

[0001] This invention relates to the field of flue gas desulfurization byproduct utilization technology, and more specifically, to a sulfur and chlorine fixation agent for waste-derived fuel, its application, and waste-derived fuel. Background Technology

[0002] With the continuous acceleration of urbanization and the further improvement of people's living standards in my country, the output of urban domestic waste has increased rapidly. Domestic waste has disadvantages such as complex composition, looseness, low density, easy perishability, and difficulty in transportation and storage. At present, it is generally collected and transported in a mixed manner, and the main treatment methods are landfill, composting and incineration.

[0003] In recent years, the proportion of landfill and composting has been declining, while incineration, as an effective method of waste reduction and energy conversion, has received increasing attention and its share has been rising year by year. However, direct waste incineration suffers from problems such as low treatment efficiency, high energy consumption, and secondary pollution from acidic gases, dioxins, and fly ash, making the construction of waste incineration plants difficult. Accordingly, the concept of Refuse Derived Flue (RDF) has been proposed both domestically and internationally, and related research and development results have been successively applied in practice.

[0004] Waste-derived fuel (RDF) technology involves processing municipal solid waste through crushing, sorting, drying, adding additives, and extrusion molding to produce solid (cylindrical) fuel. RDF is characterized by high density, high calorific value, good combustion performance, ease of transportation and storage, and convenient centralized disposal. As a coal alternative, it is increasingly used in incineration boilers, power plant boilers, cement kilns, and heating projects.

[0005] The raw materials used in RDF production often contain chlorine- and sulfur-containing solid waste, such as plastics, rubber, and kitchen scraps. During high-temperature incineration, these materials release acidic gases like HCl and SO2. The acidic gases, upon condensation from water vapor, form an acidic solution that severely corrodes equipment, shortens its lifespan, and easily generates dioxins, complicating exhaust gas treatment. Current technologies typically involve end-of-pipe desulfurization and dechlorination of the exhaust gas through methods such as injecting lime powder or using alkaline scrubbing. However, desulfurization and dechlorination after the incinerator requires significant investment and incurrs high operating costs, and cannot completely prevent corrosion of the furnace and secondary combustion chamber by acidic gases. Therefore, implementing desulfurization and dechlorination treatment during RDF incineration can reduce HCl and SO2 emissions at the source, thereby reducing equipment corrosion, extending equipment lifespan, and lowering subsequent exhaust gas and wastewater treatment costs.

[0006] On the other hand, with the widespread application of dry / semi-dry flue gas desulfurization processes in flue gas treatment fields such as steel plant sintering machines, coal-fired power plants, non-ferrous smelters, and waste incineration plants, the demand for calcium-based desulfurization ash is increasing daily. Calcium-based desulfurization ash is a light gray powder, resembling cement in appearance, with extremely fine particles (average particle size below 10 μm), extremely low moisture content (0.1%–0.5%), and a bulk density of 0.55–1.0 t / m³. 3 The true density is between 2.25 and 2.69 t / m³. 3 Within the specified range. When desulfurization ash is compacted with water, its compaction density can reach 1.4 t / m³. 3 The optimal water content is 21%–26%. Desulfurization ash has a complex composition with large fluctuations in chemical composition. The content of extremely fine fly ash such as SiO2, Al2O3, and Fe2O3 ranges from 3.5% to 20%, while the content of alkaline components such as CaSO3, CaCO3, f-CaO, and Ca(OH)2 is high (resulting in incomplete absorption and significant waste). Calcium-based desulfurization ash is unstable, enriched with heavy metals, and has a high content of inert impurities. It is prone to dust generation during storage and transportation, making its treatment and disposal very difficult. Currently, the main methods of disposal for desulfurization ash both domestically and internationally are stockpiling and dumping. In addition, there are some exploratory utilization methods, such as using it as a cement retarder, concrete admixture, wall material, mortar material, or for engineering filling, gradation materials, and soft foundation reinforcement. These are mostly passive end-of-pipe treatments with problems such as low usage and low added value.

[0007] Chinese Patent Publication No. CN 102614773 A discloses a method for using semi-dry desulfurization ash for in-furnace desulfurization in boilers. The dry desulfurization ash is sent to the furnace of the boiler or the coal feed port on the boiler through an additional pipeline to carry out in-furnace desulfurization reaction. The aim is to take advantage of the desulfurization effect of the residual calcium-based materials in the desulfurization ash and reduce the desulfurization cost of power plants. However, the oxidizing atmosphere in the furnace is insufficient, making it difficult to fully oxidize and transform the unstable components in the desulfurization ash.

[0008] Chinese patent application CN200910194833.5 utilizes wet desulfurization engineering to co-process desulfurization ash. The technical principle is as follows: in the slurry pool of the wet absorption tower, alkaline components such as CaSO3, CaCO3, f-CaO, and Ca(OH)2 in the desulfurization ash undergo absorption, oxidation, and neutralization reactions with SO2 in the flue gas to generate desulfurization gypsum. However, directly using desulfurization ash as part of the desulfurization agent to replace limestone powder may have some negative impacts on the wet system.

[0009] Chinese patent applications CN200910180052.0, CN200910263921.6, CN201110209483.2, CN200610123966.X, and CN201110072276.7 also introduce some exploratory utilization methods, such as using them as cement retarder, concrete admixture, wall material, mortar material, or engineering filling, gradation material, and soft foundation reinforcement. However, these technologies are mostly passive end-of-pipe treatments, and have problems such as low usage and low added value.

[0010] With the implementation of national requirements for ultra-low emissions from steel enterprises, sodium-based flue gas desulfurization systems are widely used in the dry quenching coke oven process systems of steel plants. They are characterized by high efficiency and low cost. However, the sodium-based desulfurization ash generated as a byproduct is difficult to utilize as a resource, which has become a problem for the resource utilization of solid waste in steel enterprises. Coke oven flue gas desulfurization mainly draws on the flue gas desulfurization processes of the power and sintering industries. Among them, the SDA (Spray Dryer Absorber) process is widely used. The main components of coke oven desulfurization ash are a mixture of Na2CO3 (5-30%), NaHCO3 (5-30%), Na2SO4 (30-60%), and Na2SO3 (5-20%). Due to its complex composition, the actual comprehensive utilization of desulfurization ash is limited. The main ways to utilize sodium-based desulfurization ash from coke ovens are: producing chemical raw materials and making fertilizers (CN103194596A, CN211871388U, CN113149263A, CN118183797A). However, due to its limited purity, market utilization is difficult, and due to the influence of alkali metals on blast furnaces, it cannot be recycled back into the main steel system.

[0011] In response to the problems of severe equipment corrosion and increased exhaust gas treatment caused by the release of acidic gases such as HCl and SO2 during the combustion of RDF, as well as the complex composition, unstable properties, and high treatment difficulty of calcium-based desulfurization ash from sintering flue gas / coal-fired boiler flue gas and sodium-based desulfurization ash from coke oven flue gas, this invention provides a sulfur and chlorine fixation agent suitable for waste-derived fuels and its application, to improve the combustion emission of RDF, while treating waste with waste and disposing of and converting two kinds of difficult-to-treat desulfurization ash. Summary of the Invention

[0012] To address the shortcomings of existing technologies, the purpose of this invention is to provide a sulfur and chlorine fixation agent for waste-derived fuels, its application, and waste-derived fuels. This agent can significantly reduce the volatilization rate of S and Cl during the combustion process of waste-derived fuels, making it suitable for the subsequent utilization of waste-derived fuels in incinerators and gasifiers. It can also synergistically treat calcium-based and sodium-based desulfurization ash from steel plants, achieving the effects of treating waste with waste, low investment, and quick results.

[0013] To achieve the above objectives, the present invention adopts the following technical solution:

[0014] A first aspect of the present invention provides a sulfur and chlorine fixation agent for waste-derived fuels, the raw materials of which comprise the following components in parts by weight:

[0015] 50-80 parts of calcium-based desulfurization ash;

[0016] 5-30 parts of sodium-based desulfurization ash;

[0017] 5-30 parts quicklime;

[0018] Oxidizing agent 3-15 parts.

[0019] Preferably, the calcium-based desulfurization ash is a byproduct of the dry / semi-dry desulfurization process for sintering machine flue gas / pelletizing plant flue gas / coal-fired power plant flue gas / waste incineration plant flue gas;

[0020] The sodium-based desulfurization ash is a byproduct of the dry / semi-dry sodium desulfurization process for coke oven flue gas.

[0021] The oxidant is selected from one or a combination of several of hydrogen peroxide, peracetic acid, potassium permanganate, ammonium persulfate, sodium percarbonate, sodium perborate, and potassium perborate.

[0022] A second aspect of the present invention provides an application of a sulfur and chlorine fixation agent for waste-derived fuels in waste-derived fuels.

[0023] A third aspect of the present invention is a waste-derived fuel, the raw materials of which include the desulfurization and chlorination agent as described in the first aspect of the present invention, as well as combustible waste fines and moisture;

[0024] The raw materials, by weight, are as follows:

[0025] 65-80 portions of combustible waste fines;

[0026] 5-15 parts of sulfur- and chlorine-fixing agent;

[0027] Moisture content: 15-20 parts.

[0028] Preferably, the combustible waste fines are obtained by crushing combustible waste from the dry waste of household waste; in the combustible waste fines, 90% of the particles are less than 5 mm in diameter and the moisture content is less than 10%.

[0029] Preferably, the waste-derived fuel is obtained by mixing and pressing the combustible waste fines, moisture, and sulfur- and chlorine-fixing agents.

[0030] Preferably, the molding pressure used during the molding and pressing process is 10-15 MPa.

[0031] Preferably, the waste-derived fuel has a compressive strength ≥1450N / piece and a density ≥1.1g / cm³. 3 The elongation rate is ≤10%, the 7-day durability index is ≥80, and the lower heating value is ≥15MJ / kg; when the waste-derived fuel is burned, the volatilization rate of sulfur is ≤55%, and the volatilization rate of chloride is ≤25%.

[0032] The beneficial effects of this invention are as follows:

[0033] 1. The raw materials of this invention use calcium-based desulfurization ash from sintering machine flue gas / pelletizing plant flue gas / coal-fired power plant flue gas / waste incineration plant flue gas and sodium-based desulfurization ash from coke oven flue gas as the main raw materials for the desulfurization and chlorination fixation agents. The calcium-based desulfurization ash and sodium-based desulfurization ash contain unreacted alkaline effective components such as CaCO3, f-CaO, Ca(OH)2, NaHCO3, and Na2CO3, which can play the role of desulfurization and chlorination fixation agents in the incineration of waste-derived fuels, reduce the emission of acidic gases such as HCl and SO2 in the incineration flue gas, realize waste treatment and reduce costs;

[0034] 2. In the desulfurization and chlorination agent of the present invention, the role of quicklime is to adjust the content of calcium-based oxides to ensure the effect of desulfurization and chlorination, and the role of the oxidant combination is to fully convert the unstable components in the desulfurization ash.

[0035] 3. The two types of desulfurization ash of this invention are used as raw materials for desulfurization and chlorination fixation agents, which can be used as ingredients for waste-derived fuels, solving the problem of disposal of desulfurization ash. When the desulfurization and chlorination fixation agent is used as an ingredient, it is compounded and mixed with fine combustible waste. During the incineration process after molding, the unstable component CaSO3 in the desulfurization ash can be converted into CaSO4, and other components can also be further solidified and transformed at high temperatures. With the help of the flue gas purification facilities of the incineration system, while the effective components are fully utilized, harmful components and inert components such as SiO2, Al2O3, and Fe2O3 can also enter the ash residue and be utilized as building materials.

[0036] 4. This invention compresses waste into solid waste-derived fuel at normal temperature and pressure, with a simple process and low energy consumption;

[0037] 5. The sulfur- and chlorine-fixing agent of the present invention can reduce the ignition performance of waste, so that the waste-derived fuel will not ignite at the inlet and burn immediately in the incinerator, thereby improving the fuel combustion performance and facilitating the complete combustion of waste-derived fuel in the incinerator.

[0038] 6. The two types of desulfurization ash used in the desulfurization and chlorination agent of this invention have fine particle sizes. After being compounded and molded with fine combustible waste materials, the finished waste-derived fuel has high compressive strength and high molding rate, making it easy to transport and store. It is more suitable for the subsequent use of waste-derived fuel in incinerators and gasifiers.

[0039] 7. This invention is simple and easy to implement, requires little investment, yields quick results, and has low emissions. It is a typical example of the synergistic utilization of urban domestic waste and industrial solid waste, turning waste into treasure. It has positive significance for building "zero-waste cities" and for the green and low-carbon utilization, carbon peaking, and carbon neutrality of domestic waste. Attached Figure Description

[0040] Figure 1 This is a flowchart illustrating the preparation of the sulfur and chlorine fixation agent for waste-derived fuels according to the present invention and its application in waste-derived fuels.

[0041] Figure 2 A flowchart for preparing waste-derived fuel from municipal solid waste according to the present invention. Detailed Implementation

[0042] To better understand the above-mentioned technical solutions of the present invention, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0043] This invention provides a sulfur and chlorine fixation agent for waste-derived fuels, the raw materials of which include the following components in parts by weight:

[0044] 50-80 parts of calcium-based desulfurization ash;

[0045] 5-30 parts of sodium-based desulfurization ash;

[0046] 5-30 parts quicklime;

[0047] Oxidizing agent 3 to 15 parts.

[0048] Calcium-based desulfurization ash is a byproduct of dry / semi-dry flue gas calcium desulfurization processes in steel sintering plants, pellet plants, coal-fired power plants, and waste incineration plants.

[0049] Sodium-based desulfurization ash is a byproduct of the sodium desulfurization process for coke oven flue gas in dry / semi-dry processes.

[0050] The two types of desulfurization ash mentioned above are the main raw materials for desulfurization and chlorine fixation agents for waste-derived fuels. They contain alkaline effective components such as unreacted CaCO3, f-CaO, Ca(OH)2, NaHCO3, and Na2CO3, which can play the role of desulfurization and chlorine fixation agents in the combustion of solid briquetted fuels.

[0051] Quicklime is a commercially available product; quicklime can adjust the calcium-based oxide content in raw materials to ensure the effect of chlorine and sulfur fixation.

[0052] The oxidant is selected from one or a combination of several of hydrogen peroxide, peracetic acid, potassium permanganate, ammonium persulfate, sodium percarbonate, sodium perborate, and potassium perborate; the oxidant can fully convert the unstable components in the desulfurization ash.

[0053] The raw materials for the sulfur and chlorine fixation agent for waste-derived fuels are mixed evenly according to the above-mentioned weight proportions to obtain a powdered sulfur and chlorine fixation agent.

[0054] Combination Figure 1 As shown, the aforementioned sulfur and chlorine fixatives for waste-derived fuels can be applied to waste-derived fuels.

[0055] The present invention also provides a waste-derived fuel, the raw materials of which include the aforementioned desulfurization and chlorination agents, combustible waste fines, and moisture; these raw materials are as follows by weight:

[0056] 65-80 portions of combustible waste fines;

[0057] 5-15 parts of sulfur- and chlorine-fixing agent;

[0058] Moisture content: 15-20 parts.

[0059] Combustible waste fines are obtained by crushing combustible waste from dry household waste, removing inert components such as stones, glass, and ceramic shards; 90% of the combustible waste fines have a particle size of less than 5mm and a moisture content of less than 10%.

[0060] Combination Figure 2 As shown, waste-derived fuel is obtained by mixing and pressing combustible waste fines, moisture, and sulfur- and chlorine-fixing agents; specifically as follows:

[0061] (1) Household waste is separated into dry and wet waste. Dry waste is divided into hazardous waste (waste batteries, fluorescent tubes, waste paint cans, waste medicines, etc.), recyclables (broken glass, waste metal, brick and stone slag, broken tiles, decoration concrete, etc.) and combustible waste (waste plastics, waste rubber, packaging materials, cardboard, wood boards, etc.). Hazardous waste is entrusted to professional disposal, recyclables are sent for resource utilization, and combustible waste is crushed to obtain fine materials.

[0062] (2) Combustible waste fines, water, and sulfur and chlorine fixation agents are mixed and pressed to obtain waste-derived fuel; wherein the molding pressure used during molding and pressing is 10-15 MPa.

[0063] The above-mentioned waste-derived fuels have a compressive strength ≥1450N / piece and a density ≥1.1g / cm³. 3 The elongation rate is ≤10%, the 7-day durability index is ≥80, and the lower heating value is ≥15MJ / kg; when the waste-derived fuel is burned, the volatilization rate of sulfur is ≤55%, and the volatilization rate of chloride is ≤25%.

[0064] Example

[0065] The desulfurization and chlorination fixation agent for waste-derived fuel in this embodiment is composed of calcium-based desulfurization ash, sodium-based desulfurization ash, quicklime, and oxidant.

[0066] The weight proportions of the ingredients are as follows:

[0067] 50-80 parts of calcium-based desulfurization ash;

[0068] 5-30 parts of sodium-based desulfurization ash;

[0069] 5-30 parts quicklime;

[0070] 3-15 parts of oxidizing agent;

[0071] The above-mentioned method for preparing the sulfur and chlorine fixative for waste-derived fuel involves mixing the components evenly according to the above-mentioned weight proportions to obtain a powdered sulfur and chlorine fixative.

[0072] The calcium-based desulfurization ash is a byproduct of the circulating fluidized bed semi-dry flue gas desulfurization process in the pelletizing plant of an iron and steel enterprise. It contains 6.7% CaSO4·H2O, 59.6% CaSO3·1 / 2H2O, 14.3% f-CaO, 9.5% Ca(OH)2, 6.2% SiO2, 1.1% Al2O3, 0.5% MgO, 0.4% Fe2O3, 5% Cl, and approximately 2% Pb, Zn, Cu, and other metals. 90% of the particles have a diameter less than 10 μm, and the moisture content is less than 1%.

[0073] Sodium-based desulfurization ash is a byproduct of the dry sodium desulfurization process using spray drying (SDA) of coke oven gas in steel enterprises. It contains 25.5% Na2CO3, 15.8% NaHCO3, 40.4% Na2SO4, 10.2% Na2SO3, 3.2% SiO2, 1.5% Al2O3, 1.8% MgO, 0.8% Fe2O3, 3% Cl, and approximately 1% Pb, Zn, Cu, and other metals. 90% of the particles have a diameter less than 10 μm, and the moisture content is less than 1%.

[0074] Quicklime is a commercially available product with a calcium oxidation rate of 90% and impurities of less than 5%.

[0075] The oxidizing agent is one or a combination of hydrogen peroxide, peracetic acid, potassium permanganate, ammonium persulfate, sodium percarbonate, sodium perborate, and potassium perborate.

[0076] Combination Figure 1 and 2 As shown, the application of the above-prepared waste-derived fuel desulfurization and chlorination fixation agent in waste-derived fuel specifically includes the following steps:

[0077] (1) Household waste is separated into dry and wet waste. Dry waste is divided into hazardous waste (waste batteries, fluorescent tubes, waste paint cans, waste medicines, etc.), recyclables (broken glass, waste metal, brick and stone slag, broken tiles, decoration concrete, etc.) and combustible waste (waste plastics, waste rubber, packaging materials, cardboard, wood boards, etc.). Hazardous waste is entrusted to professional disposal, recyclables are sent for resource utilization, and combustible waste is crushed to obtain fine materials.

[0078] Combustible waste fines are obtained through multi-stage crushing and sorting, removing inert components such as stones, glass, and ceramic pieces. 90% of the particles are less than 5mm in diameter and have a moisture content of 8%.

[0079] (2) Combustible waste fines, moisture and waste-derived fuel are mixed with a sulfur-fixing and chlorine-fixing agent to obtain a mixture, which is then pressed under a molding pressure of 10-15 MPa to obtain waste-derived fuel.

[0080] The weight proportions of the waste-derived fuel raw materials are as follows: 65-80 parts of combustible waste fines; 5-15 parts of sulfur-fixing and chlorine-fixing agents; and 15-20 parts of moisture.

[0081] The formulations of the sulfur and chlorine fixation agents for waste-derived fuels in Examples 1-5 are shown in Table 1, and the formulations and properties of the waste-derived fuels are shown in Table 2.

[0082] The comparative example is the preparation of waste-derived fuel using combustible waste fines and moisture without the addition of sulfur- and chlorine-fixing agents. The formulation and performance of the waste-derived fuel are shown in Table 2.

[0083] Table 1. Ingredients for sulfur and chlorine fixation agents used in waste-derived fuels

[0084]

[0085] Table 2. Waste-derived fuel ingredients and performance

[0086] Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example Combustible waste fines (wt%) 70 75 80 65 80 85 Sulfur and chlorine fixing agent (wt%) 10 8 5 15 10 0 Moisture content of the mixture (%) 20 17 15 20 10 15 Molding pressure (MPa) 15 12 10 13 13 15 RDF shape cuboid cuboid cylinder cube cylinder cuboid Compressive strength (N / piece) 1550 1600 1800 1500 1450 1200 <![CDATA[RDF density (g / cm 3 )]]> 1.25 1.13 1.20 1.35 1.20 1.10 RDF elongation (%) 7 8.0 7.5 5.5 5.0 8.0 RDF 7-day durability index 111 105 88 85 90 75 Lower heating value (MJ / kg) 17.5 17.8 18.8 19.8 19.5 20 S element volatilization rate (%) 50.2 48.2 43.5 45.8 44.5 78.8 Cl volatilization rate (%) 20.1 17.8 17.5 16.7 20.5 40.5

[0087] As shown in Tables 1 and 2, the compressive strength of the waste-derived fuels after adding sulfur- and chlorine-fixing agents in Examples 1-5 of this invention is 1450-1800 N / piece, and the density is 1.13-1.35 g / cm³. 3 With an elongation of 5.0–8.0%, it can meet the needs of long-term stockpiling and long-distance transportation. Its low calorific value meets the fuel calorific value requirements of energy-consuming units such as waste incineration plants and cement kilns. In the comparative example, the volatilization rates of S and Cl elements during combustion of the waste-derived fuel without added sulfur and chlorine fixation agents were 78.8% and 40.5%, respectively. In the embodiments of this invention, different proportions of sulfur and chlorine fixation agents were added, and after combustion, the volatilization rates of S and Cl elements decreased to 43.5%–50.2% and 16.7%–20.5%, respectively, demonstrating significant sulfur and chlorine fixation effects.

[0088] Those skilled in the art should recognize that the above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Any variations or modifications to the above embodiments that are within the spirit and essence of the present invention will fall within the scope of the claims of the present invention.

Claims

1. A sulfur and chlorine fixation agent for waste-derived fuels, characterized in that, Its raw materials include the following components by weight: 50-80 parts of calcium-based desulfurization ash; 5-30 parts of sodium-based desulfurization ash; 5-30 parts quicklime; Oxidizing agent 3 to 15 parts.

2. The sulfur and chlorine fixation agent for waste-derived fuel according to claim 1, characterized in that: The calcium-based desulfurization ash is a byproduct of the dry / semi-dry desulfurization process for sintering machine flue gas, pellet plant flue gas, coal-fired power plant flue gas, and waste incineration plant flue gas. The sodium-based desulfurization ash is a byproduct of the dry / semi-dry sodium desulfurization process for coke oven flue gas. The oxidant is selected from one or a combination of several of hydrogen peroxide, peracetic acid, potassium permanganate, ammonium persulfate, sodium percarbonate, sodium perborate, and potassium perborate.

3. The application of a sulfur and chlorine fixation agent for waste-derived fuels.

4. A waste-derived fuel, characterized in that, Its raw materials include the sulfur-fixing and chlorine-fixing agent as described in claim 1 or 2, as well as combustible waste fines and moisture; The raw materials, by weight, are as follows: 65-80 portions of combustible waste fines; 5-15 parts of sulfur- and chlorine-fixing agent; Moisture content: 15-20 parts.

5. The waste-derived fuel according to claim 4, characterized in that: The combustible waste fines are obtained by crushing combustible waste from the dry waste of household waste; in the combustible waste fines, 90% of the particles are less than 5mm in diameter and the moisture content is less than 10%.

6. The waste-derived fuel according to claim 4, characterized in that: The waste-derived fuel is obtained by mixing and pressing the combustible waste fines, moisture, and sulfur and chlorine fixation agents.

7. The waste-derived fuel according to claim 6, characterized in that: The molding pressure used during the molding and pressing process is 10-15 MPa.

8. The waste-derived fuel according to claim 4, characterized in that: The waste-derived fuel has a compressive strength ≥1450N / piece and a density ≥1.1g / cm³. 3 The elongation rate is ≤10%, the 7-day durability index is ≥80, and the lower heating value is ≥15MJ / kg; when the waste-derived fuel is burned, the volatilization rate of sulfur is ≤55%, and the volatilization rate of chloride is ≤25%.

Images