CN-118703244-B - Coal additive by means of aluminum sulfate reaction and preparation method and application thereof

Abstract

The invention provides a fire coal additive by means of aluminum sulfate reaction, which comprises, by weight, 40% -55% of a catalyst, 25% -35% of an oxidant, 10% -20% of fluorite and 2% -6% of calcium silicate powder, wherein the catalyst is composed of aluminum powder and sulfate according to a molar ratio of (3-4): 1. The invention also provides a preparation method of the fire coal additive by means of aluminum sulfate reaction, which comprises the steps of mixing the dried raw material powder with organic binder prepared by organic cellulose and water, preparing a plurality of pellets, and drying to obtain the fire coal additive. The invention also provides application of the fire coal additive by means of aluminum sulfate reaction in improving the fire coal combustion efficiency, and the fire coal additive can greatly improve the fire coal combustion efficiency by means of a high heat release system formed by aluminum and sulfate, is low in manufacturing cost, safe and environment-friendly, and has wide popularization and application prospects.

Inventors

• ZHANG GUODONG
• LI CHENGLIN
• HUANG LONG
• Gong Yinqing
• WANG XIAOHAN
• YANG YUE
• LI MENGZHAO
• ZHOU YICHENG
• YANG BING
• MEI QINGSONG

Assignees

• 武汉大学

Dates

Publication Date

20260512

Application Date

20240611

Claims (8)

1. 1. The fire coal additive by means of aluminum sulfate reaction is characterized by comprising, by weight, 40% -55% of a catalyst, 25% -35% of an oxidant, 10% -20% of fluorite and 2% -6% of calcium silicate powder, wherein the catalyst is composed of aluminum powder and sulfate according to a molar ratio of (3-4): 1; The fire coal additive is prepared by the following steps of drying the raw materials, mixing the raw materials to obtain additive powder, adding an organic adhesive prepared from organic cellulose and water according to a mass ratio of 1 (30-50), wherein the dosage of the organic adhesive is 0.5-2% of the total weight of the additive powder, uniformly mixing, preparing a plurality of pellets, and drying to obtain the fire coal additive.
2. 2. The fire coal additive of claim 1 wherein the sulfate is selected from the group consisting of one or more of calcium sulfate, magnesium sulfate, barium sulfate, sodium sulfate.
3. 3. The fire coal additive according to claim 1, wherein the oxidizing agent is composed of potassium permanganate and potassium perchlorate in a mass ratio of (1-2): 1.
4. 4. The fire coal additive of claim 1 wherein the fluorite has a purity of greater than 97wt% and a particle size of 150-300 mesh.
5. 5. The fire coal additive according to claim 1, wherein the silicon content in the silicon-calcium powder is 55wt% to 65 wt%, the calcium content is more than 28 wt%, and the particle size of the silicon-calcium powder is 150-300 mesh.
6. 6. The fire coal additive according to claim 5, wherein the temperature of the drying treatment is 60-100 ℃, the drying treatment time is 3-6h, the powder mixing process is carried out by a 3D powder mixer, and the powder mixing time is 6-10h.
7. 7. The fire coal additive according to claim 1, wherein the pellets have a diameter of 0.9-1cm.
8. 8. Use of a fire coal additive according to any one of claims 1-7, characterized in that the fire coal additive is mixed with coal fines in a mass ratio of (1-3): 1000 and then injected into a blast furnace for combustion.

Description

Coal additive by means of aluminum sulfate reaction and preparation method and application thereof Technical Field The invention belongs to the technical field of coal-fired additives, and particularly relates to a coal-fired additive by means of aluminum sulfate reaction and a preparation method thereof, and application of the coal-fired additive in improving combustion efficiency of coal. Background The world has limited coal resources, the storage capacity is continuously reduced, the demand of the social development on coal is increasingly increased, and the price of the coal is also continuously increased. On the one hand, the coal is required to be saved, on the other hand, measures are required to improve the utilization efficiency of coal. Therefore, much attention is paid to how to achieve the purpose of saving energy by improving the combustion efficiency of coal and further improving the thermal efficiency of equipment, wherein the block of coal combustion improver is a research hot spot. By adding a small amount of combustion-supporting additive into the coal to promote the complete combustion of the coal, the heat loss of incomplete combustion can be reduced, and the emission of smoke dust can be reduced. From the aspects of energy conservation and environmental protection, the method has very important practical significance. The fire coal additive is made from a plurality of chemical raw materials according to a certain proportion, and is multipurpose to improve the combustion efficiency of coal and improve the pollution of fire coal industry to the environment. The coal additive typically comprises an oxidant, a catalyst, a desulfurizing agent, a leavening agent, a smoke suppressor, and other organic adjuvants, each of which perform a different function. The oxidant can provide more active oxygen for coal combustion, so that the combustion efficiency of the coal is improved. The catalyst can accelerate the chemical reaction rate in the coal combustion process, the conversion and transfer of active oxygen, and the like. The leavening agent such as industrial salt can generate micro-explosion in a high-temperature area in the hearth, so that impurities on the surface of coal are cleaned, and incomplete combustion in the coal burning process is reduced. Desulfurizing agents, also known as sulfur fixing agents, are, as their name suggests, capable of reacting with sulfur oxides in the coal burning process to prevent them from entering the atmosphere and deteriorating ecology. From the practical application conditions of domestic and foreign patent retrieval and literature retrieval, the existing coal-fired additive is summarized into three types of combustion supporting, biomass fuel and sulfur fixing from the published principle and formula. The patent CN 114410362A adopts bamboo powder as biomass fuel to be added into coal, SO that the combustion quality of the coal is improved, the operation problems of high-temperature corrosion, slagging, sintering and the like caused in the combustion process of the biomass fuel are solved, but the problem that the biomass fuel cannot be pressed into a boiler when the temporary furnace shutdown time is too long due to the fact that the ignition temperature is far lower than that of the coal still exists, the patent CN 103160356A focuses on the treatment of NO X and SO X after the combustion of the coal, a better effect is finally obtained, the preparation process is complex, the production cost is high, the patent CN 104087692 adopts aluminum powder for combustion supporting only, the economic efficiency and the practicability are high, but the explosion sensitivity coefficient of the aluminum powder as inflammable and explosive powder is extremely high, and a large amount of aluminum powder in industrial production is extremely easy to cause safety accidents. Based on the above, a brand new fire coal additive with high heat release and a preparation method thereof are developed, and the fire coal additive can improve the self combustion efficiency of fire coal, ensure the safety in actual production and give consideration to economic benefit and environmental protection, and are technical problems to be solved. Disclosure of Invention The invention aims to provide a safe and environment-friendly fire coal additive which can obviously improve the combustion efficiency of fire coal. The second aim of the invention is to provide a preparation method of the fire coal additive which can obviously improve the combustion efficiency of fire coal, is safe and environment-friendly. It is a further object of the present invention to provide the use of a fire coal additive by means of an aluminium sulphate reaction for increasing the combustion efficiency of fire coal. The invention provides a fire coal additive by means of aluminum sulfate reaction, which comprises the following raw materials in percentage by weight: 40-55% of catalyst, 25-35% of oxidant, 10-20% of