Surface spray fusing anti-corrosion anti-abrasion heat superconducting nano-graphene alloy powder and manufacturing method thereof

Abstract

The invention provides surface spray fusing anti-corrosion anti-abrasion heat superconducting nano-graphene alloy powder and a manufacturing method thereof. The surface spray fusing anti-corrosion anti-abrasion heat superconducting nano-graphene alloy powder is composed of nano-graphene powder, superfine iron powder, yttrium oxide, cerium oxide powder, neutral zirconium dioxide sol, light magnesium oxide powder and nickel 50% chromium alloy powder. Ceramic balls are placed and mixed for 48 hours, copious cooling is conducted for 48 hours at the temperature of -196 DEG C, the mixture is heated to 200 DEG C lasting for 12 hours and is destressed, the superfine iron powder forms a partial semi-amorphous material, the powder cannot be cracked in the cladding process, meshes are better formed, nano-graphene fully exerts the heat conduction performance, and after the powder is copiously cooled and heated, 10% to 15% of resin is added, 5% to 15% of ethyl alcohol is then added, and stirring is conducted for 13 hours. Compared with 316 stainless steel, the powder is more resistant to corrosion and abrasion, service life is prolonged by more than five times, hardness is higher, rigidity is better, the bonding strength and the hardness of a coating are high, stress is small, no deformation or disengagement exists in the high-temperature cladding process, and the powder is denser after surface cladding.

Description

technical field [0001] The invention relates to core components used in the manufacture of drums, burners, water-cooled wall superheaters, economizers, air preheaters, reheaters, etc. in large-scale coal-fired power plants, and can also be widely used in petrochemical corrosion-resistant and wear-resistant pipes Workpiece production materials, especially a superconducting heat-conducting nano-graphene alloy powder and a manufacturing method thereof. Background technique [0002] At present, the coolers used in coal-fired power plants are all bare tube or finned tube economizers. The disadvantages are: 1) Most of the bare tube or finned tube economizers use welded wound fins or expanded tube fins. It is easy to separate from the tube to create a gap, which will cause a large thermal resistance at the root of the fin and accelerate the corrosion rate, thereby affecting the heat transfer effect. Tubular regenerators have low compactness, poor heat transfer capacity, and low ef...

AI Technical Summary

Problems solved by technology

[0002] At present, the coolers used in coal-fired power plants are all bare tube or finned tube economizers. The disadvantages are: 1) Most of the bare tube or finned tube economizers use welded wound fins or expanded tube fins. It is easy to separate from the tube to create a gap, which will cause a large thermal resistance at the root of the fin and accelerate the corrosion rate, thereby affecting the heat transfer effect

Tubular regenerators have low compactness, poor heat transfer capacity, and low efficiency. They need to consume a large amount of tubes, occupy a large area, and have high production costs. Moreover, on the side of the finned tubes, since the medium is in vertical contact with the heat exchange tubes, It leads to increased flow resistance, easy to accumulate dust (or scale) and easy to corrode with steam flushing, which affects the life of the regenerator

2) The structure of the finned tube heat exchanger is easy to accumulate dust

Since the heat exchanger adopts a tube structure, the flue gas is in vertical contact with the tube, which will inevitably increase the side resistance drop of the flue gas, and the fins and tube walls are prone to dust accumulation.

3) Due to the influence of low-temperature dew point acid corrosion on the heat exchanger, it may cause rapid corrosion of the heat exchange tube and affect the safe operation of the power plant

Spraying ceramic material on the surface of the tube can solve the life problem of the cooler, but the heat transfer coefficient of the ceramic material is extremely low, only about 1W / (m·k), which affects the heat transfer performance of the cooler

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