Application of magnesium aluminum spinel in fluid heaters

Abstract

This invention relates to the application of magnesium aluminum spinel in fluid heaters. Through precise processing of fused magnesium aluminum spinel via multiple steps including crushing, spheroidizing, sieving, demagnetizing, mixing, drying, and dust removal, high-purity, high-cleanliness, and high-stability magnesium aluminum spinel material is prepared. Applying this material to fluid heaters significantly improves the heater's heat exchange efficiency, high-temperature resistance, and anti-aging capabilities, reduces impurity contamination, extends equipment lifespan, and meets the needs of large-scale, high-efficiency operation of various fluid heaters.

Description

Technical Field

[0001] This invention relates to the field of fluid heater materials technology, and in particular to the application of magnesium aluminum spinel in fluid heaters. Background Technology

[0002] Fluid heaters are key equipment in industrial production, heating, and fluid transport systems. The high-temperature resistance, thermal conductivity, stability, and cleanliness of their internal heat exchange medium / filling material directly determine the heater's heat exchange efficiency, service life, and operational safety. Magnesium aluminum spinel, as a high-quality refractory material, possesses advantages such as high temperature resistance, good thermal stability, high thermal conductivity, and strong chemical stability, making it suitable for the high-temperature, high-flow-rate, and high-heat-exchange working environment of fluid heaters.

[0003] Traditional fluid heaters commonly use quartz sand and ordinary ceramic particles as heat exchange materials. These materials have problems such as low high temperature resistance, low thermal conductivity, easy cracking and pulverization at long-term high temperatures, and magnetic impurities that easily adsorb metal debris and block the flow channel. As a result, the heat exchange efficiency of the heater decreases year by year, the maintenance frequency is high, the service life is short, and impurities mixed into the fluid can easily contaminate the medium, making it difficult to meet the requirements of high precision, long cycle and high efficiency fluid heating.

[0004] Therefore, it is essential to provide an application of magnesium aluminum spinel in fluid heaters to address the shortcomings of existing technologies. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide an application of magnesium aluminum spinel in fluid heaters. This invention precisely processes fused magnesium aluminum spinel through multiple steps, including crushing, spheroidizing, sieving, demagnetizing, mixing, drying, and dust removal, to prepare high-purity, high-cleanliness, and high-stability magnesium aluminum spinel material. When applied to fluid heaters, it significantly improves the heater's heat exchange efficiency, high-temperature resistance, and anti-aging ability, reduces impurity contamination, extends equipment service life, and meets the needs of large-scale and high-efficiency operation of various fluid heaters.

[0006] The above-mentioned objectives of the present invention are achieved by the following technical means.

[0007] An application of magnesium aluminum spinel in a fluid heater is provided, comprising the following steps: S1: Prepare the raw material, fused magnesium aluminum spinel; S2: Add fused magnesium aluminum spinel to a ceramic pulverizer for crushing and processing; S3: The material obtained in step S2 is fed into a ball mill for spheroidization treatment; S4: Add the material obtained in step S3 to the air separator for air separation and sieving; S5: The material obtained in step S4 is demagnetized using plasma high-voltage pulse demagnetization technology to remove more than 99% of the magnetic material in the fused magnesium aluminum spinel. S6: Divide the material obtained in S5 into 1000 parts, add 1 part of methyl phenyl silicone oil and add them together into the two-dimensional material mixer for stirring and mixing to obtain a premix. S7: Add the premixed material to the rotary kiln for high-temperature drying; S8: The dried premixed material is subjected to dust removal treatment through an ion high-voltage pulse device to obtain the final fused magnesium aluminum spinel material.

[0008] Specifically, the raw material, fused magnesium aluminum spinel, is selected with an alumina content of 70%-78%.

[0009] Specifically, the ceramic pulverizer processes the raw material, fused magnesium aluminum spinel, to 2mm.

[0010] Specifically, the air separator is equipped with an air separation screen with a screen size of 300μm-75μm.

[0011] Specifically, the rotary kiln drying temperature is 150℃.

[0012] This invention precisely processes fused magnesium aluminum spinel through multiple steps, including crushing, spheroidizing, sieving, demagnetizing, mixing, drying, and dust removal, to produce high-purity, high-cleanliness, and high-stability magnesium aluminum spinel material. When applied to fluid heaters, this material significantly improves the heater's heat exchange efficiency, high-temperature resistance, and anti-aging ability, reduces impurity contamination, extends equipment lifespan, and meets the needs of large-scale and high-efficiency operation of various fluid heaters. Attached Figure Description

[0013] The invention will be further described with reference to the accompanying drawings, but the contents of the drawings do not constitute any limitation on the invention.

[0014] Figure 1 This is a flowchart illustrating the application of magnesium aluminum spinel in a fluid heater according to the present invention.

[0015] Figure 2 This is a comparison chart of production parameters for the application of magnesium aluminum spinel in a fluid heater according to the present invention. Detailed Implementation

[0016] The present invention will be further described in conjunction with the following embodiments.

[0017] Example 1.

[0018] S1: Prepare the raw material, fused magnesium aluminate spinel. Select fused magnesium aluminate spinel with an alumina content of 70%-78%. Magnesium aluminate spinel in this alumina content range has a dense crystal structure, a thermal conductivity of 25-30 W / (m・K), a high temperature resistance limit of over 1800℃, and a low coefficient of thermal expansion. It is not easy to crack or deform in the high temperature heat exchange environment of fluid heaters. At the same time, it has stable chemical properties and does not react with water, oil, acid and alkali fluids. It is suitable for various fluid medium heating scenarios, ensuring the basic performance of subsequent materials from the raw material end.

[0019] S2: Add fused magnesium aluminum spinel to a ceramic pulverizer for crushing. The ceramic pulverizer has no metal contact pollution and can accurately crush block raw materials to a particle size of 2mm. This particle size avoids the problems of low efficiency and uneven finished particles caused by excessively large particles, and also prevents excessive dust loss caused by excessively small particle size. At the same time, 2mm particles are suitable for subsequent ball mill spherical processing, laying the dimensional foundation for the preparation of regular spherical materials.

[0020] S3: The material obtained in step S2 is fed into a ball mill for spheroidization treatment. The ball mill grinds irregularly broken particles into near-spherical particles through the friction and impact between the grinding media and the material. After spheroidization treatment, the material surface is smooth and without sharp edges. When applied to fluid heaters, it can reduce fluid flow resistance, reduce energy consumption, and at the same time avoid sharp particles from abrading the inner wall of the heater and heat exchange pipelines, reduce equipment wear, and improve fluid flow stability.

[0021] S4: The material obtained in step S3 is added to an air classifier for air classification and sieving. The air classifier is equipped with air classifier screens with a specification of 300μm-75μm. Through air classification and screening, excessively fine dust and excessively coarse particles are removed, and spherical particles with uniform particle size and concentrated particle size are screened out. When the material with uniform particle size fills the inside of the fluid heater, the packing gaps are regular, the fluid distribution is uniform, the heat exchange contact area is maximized, and the problems of uneven local heat exchange and local overheating are avoided, ensuring the stable heat exchange efficiency of the heater.

[0022] S5: The material obtained in step S4 is demagnetized using plasma high-pressure pulse technology to remove over 99% of the magnetic impurities from the fused magnesium aluminum spinel. Residual magnetic impurities such as iron, cobalt, and nickel in the raw material easily attract metal debris during the operation of the fluid heater. Long-term accumulation can clog fluid channels, reduce heat exchange efficiency, and even damage the equipment. Plasma high-pressure pulse demagnetization technology uses a high-pressure pulsed electric field to precisely separate magnetic impurities, achieving a removal rate of over 99%, significantly improving material cleanliness, preventing impurity blockage and contamination, and ensuring long-term stable operation of the heater.

[0023] S6: Divide the material obtained in S5 into 1000 parts, add 1 part of methylphenyl silicone oil, and add them together into the two-dimensional material mixer for stirring and mixing to obtain a premix. Methylphenyl silicone oil is heat-resistant, hydrophobic, and has good lubricity. When added at a ratio of 1:1000, it can uniformly coat the surface of magnesium aluminum spinel particles to form an ultra-thin protective film. This not only improves the hydrophobicity of the material and prevents the material performance from deteriorating due to long-term immersion in water in the fluid, but also enhances the lubricity between particles, reducing particle wear and pulverization during subsequent baking and use. At the same time, the two-dimensional material mixer can achieve uniform mixing of the material and silicone oil, avoiding excessive or insufficient silicone oil in some areas, and ensuring the uniformity of the protective film.

[0024] S7: Add the premixed material to the rotary kiln for high-temperature drying. The rotary kiln drying temperature is 150℃. This temperature can quickly evaporate the trace moisture on the surface of the material and the light impurities remaining during the mixing process without damaging the crystal structure of magnesium aluminum spinel. At the same time, it promotes the tight bonding between methyl phenyl silicone oil and the particle surface, solidifies the protective film structure, improves the stability, moisture resistance and wear resistance of the material, and avoids the problem of local high-temperature cracking and reduced heat exchange efficiency caused by moisture residue during the operation of the heater.

[0025] S8: The dried premixed material is then subjected to dust removal treatment using an ion high-voltage pulse dust collector to obtain the final fused magnesium aluminum spinel material. During the drying process, a small amount of fine dust adheres to the surface of the material. The ion high-voltage pulse dust collector uses a high-voltage ion current to adsorb and remove the dust, further improving the cleanliness of the material, resulting in the final fused magnesium aluminum spinel material. like Figure 2 As shown in the comparison of production parameters, this invention has advantages such as high purity, high thermal conductivity, high temperature resistance, wear resistance, and cleanliness without impurities. When filled inside the fluid heater, it can replace traditional quartz sand and ceramic particles, significantly improving the heat exchange efficiency of the heater by more than 30%, extending the service life of the equipment by more than 2 times, reducing the frequency of maintenance, and is suitable for large-scale applications in multiple scenarios such as industrial fluid heating and heating.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. An application of magnesium aluminum spinel in a fluid heater, characterized in that: Includes the following steps: S1: Prepare the raw material, fused magnesium aluminum spinel; S2: Add fused magnesium aluminum spinel to a ceramic pulverizer for crushing and processing; S3: The material obtained in step S2 is fed into a ball mill for spheroidization treatment; S4: Add the material obtained in step S3 to the air separator for air separation and sieving; S5: The material obtained in step S4 is demagnetized using plasma high-voltage pulse demagnetization technology to remove more than 99% of the magnetic material in the fused magnesium aluminum spinel. S6: Divide the material obtained in S5 into 1000 parts, add 1 part of methyl phenyl silicone oil and add them together into the two-dimensional material mixer for stirring and mixing to obtain a premix. S7: Add the premixed material to the rotary kiln for high-temperature drying; S8: The dried premixed material is subjected to dust removal treatment through an ion high-voltage pulse device to obtain the final fused magnesium aluminum spinel material.

2. The application of magnesium aluminum spinel in a fluid heater according to claim 1, characterized in that: The raw material, fused magnesium aluminum spinel, is selected with an alumina content of 70%-78%.

3. The application of magnesium aluminum spinel in a fluid heater according to claim 2, characterized in that: The ceramic pulverizer processes the raw material, fused magnesium aluminum spinel, to 2mm.

4. The application of magnesium aluminum spinel in a fluid heater according to claim 3, characterized in that: The air separator is equipped with an air separation screen with a size of 300μm-75μm.

5. The application of magnesium aluminum spinel in a fluid heater according to claim 4, characterized in that: The rotary kiln is baked at a temperature of 150°C.

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